JP6208890B1 - Interdental brush - Google Patents

Abstract

To provide an interdental brush excellent in plaque removal ability. The interdental brush 1 includes a handle portion 10, a core portion 20, and a brush portion 30. The core part 20 extends linearly from the handle part 10. The brush part 30 has a plurality of main filaments 32 extending from the core part 20 in a direction intersecting with the extending direction of the core part 20. In addition to the main filament 32, the brush part 30 also has a subfilament 32a. The subfilament 32 a extends from the side surface of at least one main filament 32 in a direction intersecting with the extending direction of the main filament 32.

Description

  The present invention relates to an interdental brush.

  As a conventional interdental brush, there exists a thing described in patent document 1, for example. The interdental brush described in the document includes a gripping member and a brush unit coupled to the gripping member. The brush portion is composed of a wire and a filament extending radially outward from the wire. In order to use this interdental brush, it is only necessary to hold the gripping member in the hand and insert the brush portion between the teeth. In this state, the plaque between the teeth can be removed by reciprocating the brush portion.

JP 2010-82029 A

  In the interdental brush described above, the brush portion is usually inserted between teeth smaller than the diameter of the brush portion. For this reason, when the brush part is inserted between the teeth, the filament often falls to the near side (rear in the insertion direction of the brush part). In that case, the side of the filament, not the tip, will hit the surrounding teeth between the teeth. This has been a factor in reducing the plaque removal capability of conventional interdental brushes.

  This invention is made | formed in view of the said subject, and it aims at providing the interdental brush excellent in the plaque removal capability.

  The interdental brush according to the present invention includes a handle, a core extending linearly from the handle, and a brush having a plurality of main filaments extending from the core in a direction intersecting with the extending direction of the core, The brush portion has a subfilament extending from a side surface of at least one main filament in a direction intersecting with the extending direction of the main filament.

  In this interdental brush, the brush part has a subfilament in addition to the main filament. The subfilament extends from a side surface of at least one main filament in a direction intersecting with the extending direction of the main filament. Thus, by providing a subfilament on the side surface of the main filament, even if the tip of the main filament does not hit the teeth around the teeth, the tip of the subfilament can hit the teeth. . For this reason, the plaque removing ability is improved as compared with the case where no subfilament is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the interdental brush excellent in the plaque removal capability is implement | achieved.

It is a side view which shows 1st Embodiment of the interdental brush by this invention. It is an enlarged view which shows the main filament 32 provided with the subfilament 32a. 2 is a front view showing a brush unit 30. FIG. It is a side view which shows 2nd Embodiment of the interdental brush by this invention. It is a side view which shows 3rd Embodiment of the interdental brush by this invention. It is an enlarged view which shows the brush part 50 in FIG. It is a side view which shows the interdental brush which concerns on one modification. It is a side view which shows the interdental brush which concerns on another modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.
(First embodiment)

  FIG. 1 is a side view showing a first embodiment of an interdental brush according to the present invention. The interdental brush 1 includes a handle portion 10, a core portion 20, and a brush portion 30. The handle portion 10 is a portion that the user of the interdental brush 1 has by hand. The handle 10 has an elongated shape. The vicinity of the tip 10a of the handle 10 is bent at a substantially right angle. As a material of the handle 10, for example, a plastic such as polyethylene can be used.

  The core part 20 extends linearly from the handle part 10. The rear end 20 b of the core part 20 is connected to the front end 10 a of the handle part 10. The core part 20 has such a rigidity that it can maintain a linear shape when inserted between teeth. As the core part 20, for example, a wire made of a metal such as stainless steel can be used. The thickness of the core part 20 is about 0.1 to 0.5 mm, for example.

  The brush part 30 has a plurality of filaments (main filaments 32) extending from the core part 20 in a direction intersecting with the extending direction of the core part 20 (left-right direction in FIG. 1). In the following description, “a plurality of main filaments” refers to all the main filaments constituting the brush portion 30 unless otherwise specified. The extending direction of the main filament 32 intersects with the extending direction of the core part 20 substantially at a right angle. The plurality of main filaments 32 are fixed to the core part 20. Such fixing can be performed, for example, by sandwiching the main filament 32 between two wires that are twisted and twisted together.

  In the present embodiment, the lengths of the plurality of main filaments 32 are constant. The length of each main filament 32 is, for example, about 0.2 to 3.0 mm. The thickness of the plurality of main filaments 32 is also constant. The thickness of each main filament 32 is, for example, about 1.0 to 5.0 mil (1 mil = 0.0254 mm). The length of the brush part 30 in the extending direction of the core part 20, that is, the length of the part where the main filament 32 is provided in the core part 20 is, for example, about 5 to 15 mm. As the material of the main filament 32, for example, nylon can be used.

  In addition to the main filament 32, the brush part 30 also has a subfilament 32a. The subfilament 32 a extends from the side surface of at least one main filament 32 in a direction intersecting with the extending direction of the main filament 32. The sub-filament 32 a is provided only on some of the main filaments 32. It is preferable that the ratio (the ratio of the number) of the main filaments 32 provided with the subfilaments 32a occupying the whole of the plurality of main filaments 32 is 20% or less. The sub filament 32a is preferably provided on the main filament 32 having the maximum length among the plurality of main filaments 32. In the present embodiment, the sub-filament 32 a is provided on the main filament 32 closest to the rear end 20 b of the core portion 20 among the plurality of main filaments 32. The subfilament 32 a may be provided only on the main filament 32, or may be provided on another main filament 32.

  FIG. 2 is an enlarged view showing the main filament 32 provided with the subfilament 32a. The extending direction of the subfilament 32a intersects the extending direction of the main filament 32 substantially at a right angle. A plurality of subfilaments 32 a are provided for one main filament 32. In the following description, “a plurality of subfilaments” refers to all the subfilaments provided in one main filament unless otherwise specified. The plurality of subfilaments 32a are provided over a plurality of locations (5 locations in FIG. 2) in the extending direction of the main filament 32. The lengths of the plurality of subfilaments 32a gradually increase from the rear end 32c of the main filament 32 toward the front end 32b. The thickness of each subfilament 32 a is smaller than the thickness of the main filament 32. The subfilament 32a may be made of the same material as the main filament 32 or may be made of a different material. The subfilament 32a can be formed, for example, by raising the side surface of the main filament 32.

  FIG. 3 is a front view showing the brush unit 30. As can be seen from the figure, the plurality of main filaments 32 spread radially from the core portion 20.

  The effect of the interdental brush 1 will be described. In the interdental brush 1, the brush portion 30 has a subfilament 32 a in addition to the main filament 32. The subfilament 32 a extends from the side surface of at least one main filament 32 in a direction intersecting with the extending direction of the main filament 32. By providing the sub-filament 32a on the side surface of the main filament 32 in this way, even if the tip of the main filament 32 does not hit the teeth around the teeth, the tip of the sub-filament 32a hits the teeth. can do. Thereby, the plaque can be removed by scraping with the subfilament 32a. For this reason, compared with the case where the subfilament 32a is not provided, the plaque removal capability is improved. Therefore, the interdental brush 1 excellent in plaque removal capability is realized.

  The extending direction of the subfilament 32a intersects the extending direction of the main filament 32 substantially at a right angle. Thereby, even when the main filament 32 is in parallel with the teeth, the subfilaments 32a are easily brought into contact with the teeth.

  A plurality of subfilaments 32 a are provided for one main filament 32. Thereby, compared with the case where only one subfilament 32a is provided, the plaque removing ability can be improved.

  The plurality of subfilaments 32 a are provided over a plurality of locations in the extending direction of the main filament 32. Thereby, the subfilament 32a can reach a wide range of teeth. This also contributes to an improvement in plaque removal ability.

  When the brush part 30 is inserted between the teeth, the main filament 32 often falls to the front (backward in the insertion direction of the brush part 30). Therefore, in the main filament 32, the rear end 32c is positioned forward in the insertion direction, and the distal end 32b is positioned rearward in the insertion direction. In this regard, the lengths of the plurality of subfilaments 32a gradually increase from the rear end 32c of the main filament 32 toward the front end 32b. Thus, by making the length of the subfilament 32a ahead of the insertion direction smaller than the length of the subfilament 32a behind the insertion direction, the brush portion 30 can be easily inserted between the teeth.

  The thickness of the subfilament 32 a is smaller than the thickness of the main filament 32. Thus, reducing the thickness of the subfilament 32a actually in contact with the teeth is advantageous in improving the plaque removal capability.

  When the subfilament 32a is made of the same material as the main filament 32, the subfilament 32a can be formed by processing the side surface of the main filament 32. This is advantageous for forming the subfilament 32a at a low cost. When the subfilament 32a is formed by fluffing the side surface of the main filament 32, the formation cost of the subfilament 32a can be suppressed particularly low.

  The sub filaments 32 a are provided only on some main filaments 32 among the plurality of main filaments 32. Thereby, compared with the case where the subfilament 32a is provided in all the main filaments 32, the manufacturing cost of the interdental brush 1 can be restrained low. Thus, from the viewpoint of keeping the manufacturing cost of the interdental brush 1 low, the ratio of the main filaments 32 provided with the subfilaments 32a in the whole of the plurality of main filaments 32 is preferably 20% or less. On the other hand, if the ratio is too small, it may hinder plaque removal. From such a viewpoint, the ratio is preferably 5% or more.

  When the main filament 32 having a larger length is inserted between the teeth, the tip 32b is less likely to hit the teeth. Therefore, by providing the subfilament 32a in the main filament 32 having the maximum length among the plurality of main filaments 32, it is possible to efficiently increase the plaque removal capability.

  The length of the plurality of main filaments 32 is constant. Thereby, the brush part 30 inserted between the teeth can be reciprocated with a uniform strength.

By the way, the interdental brush is usually inserted between the teeth from the front side of the teeth. This is because the interdental brush structure makes it difficult to insert between the teeth from the back side of the teeth. This makes it difficult to remove plaque near the back surface of the teeth in the conventional interdental brush. In this regard, in the interdental brush 1, the subfilament 32 a is provided on the main filament 32 closest to the rear end 20 b of the core portion 20. When the entire brush part 30 is inserted between the teeth from the front side of the tooth, when the brush part 30 is pulled forward, the main filament 32 closest to the rear end 20b of the core part 20 is caught on the back side of the tooth. Therefore, by providing the main filament 32 with the subfilament 32a, the subfilament 32a can be brought into contact with the back side of the tooth. For this reason, according to the interdental brush 1, the plaque near the back surface of the teeth can be effectively removed.
(Second Embodiment)

  FIG. 4 is a side view showing a second embodiment of the interdental brush according to the present invention. The interdental brush 2 includes a handle portion 10, a core portion 20, and a brush portion 40. The configurations of the handle 10 and the core 20 are as described in the first embodiment.

  The brush part 40 has a plurality of filaments (main filaments) extending from the core part 20 in a direction intersecting with the extending direction of the core part 20. The plurality of main filaments include a main filament 42 (first main filament), a main filament 44 (second main filament), and a main filament 46. The main filament 42, the main filament 44, and the main filament 46 are different main filaments.

  The main filament 42 is the main filament closest to the tip 20 a of the core portion 20. The main filament 44 has a length smaller than that of the main filament 42 and is the main filament closest to the main filament 42. That is, the main filament 44 is the main filament closest to the main filament 42 among the main filaments having a length smaller than that of the main filament 42. The main filament 46 is a main filament that is closest to the rear end 20b of the core portion 20 (farthest from the front end 20a).

  The main filament 44 is naturally located between the main filament 42 and the main filament 46. When the distance from the main filament 42 to the main filament 46 is 1, the distance from the main filament 42 to the main filament 44 is preferably 0.1 or more and 0.3 or less.

  The length of the main filament 42 is larger than the average length of the plurality of main filaments. The average length is defined as an arithmetic average of the lengths of all main filaments constituting the brush portion 40. Further, the length of the main filament 42 is preferably 1.5 times or more, more preferably 2 times or more, the length of the main filament 44. The main filament 42 has the maximum length among the plurality of main filaments. The length of the main filament 42 is, for example, about 0.3 to 3.0 mm. In addition, the length of each main filament is defined as the distance from the core part 20 to the front-end | tip of the said main filament.

  The main filament 44 has a minimum length among the plurality of main filaments. The length of the main filament 44 is, for example, about 0.2 to 1.5 mm. In the present embodiment, the lengths of the plurality of main filaments are constant in the section from the main filament 44 to the main filament 46. Therefore, all the main filaments (including the main filament 44 and the main filament 46) in the section have the minimum length among the plurality of main filaments.

  The brush part 40 has a subfilament 42a. The subfilament 42a extends from the side surface of at least one main filament in a direction intersecting with the extending direction of the main filament. The subfilament 42a is provided only on some of the main filaments. In the present embodiment, the subfilament 42 a is provided on the main filament 42. The sub filament 42a may be provided only on the main filament 42, or may be provided on another main filament. The configuration of the subfilament 42a is the same as that of the subfilament 32a (see FIG. 2). The other configuration of the brush unit 40 is the same as that of the brush unit 30 described in the first embodiment.

  The effect of the interdental brush 2 will be described. In the interdental brush 2, the brush part 40 has a subfilament 42a in addition to the main filament. The subfilament 42a extends from the side surface of at least one main filament in a direction intersecting with the extending direction of the main filament. Thus, by providing the subfilament 42a on the side surface of the main filament, even if the tip of the main filament does not hit the teeth around the teeth, the tip of the subfilament 42a hits the tooth. Can do. Thereby, the plaque can be removed by scraping with the subfilament 42a. For this reason, compared with the case where the subfilament 42a is not provided, the plaque removal capability is improved. Therefore, the interdental brush 2 excellent in plaque removal capability is realized.

  The length of the main filament 42 that is closest to the tip 20 a of the core portion 20 is larger than the average length of all the main filaments that make up the brush portion 40. Thereby, even when the brush part 40 is inserted between the teeth from the front side of the tooth, the main filament 42 is easily caught on the back side of the tooth when the brush part 40 is pulled forward. For this reason, it becomes easy to remove the plaque near the back surface of the tooth.

  When the difference in length between the main filament 42 and the main filament 44 is increased, the main filament 42 is easily caught on the back side of the teeth when the brush portion 40 is pulled forward. From this viewpoint, the length of the main filament 42 is preferably 1.5 times or more, and more preferably 2 times or more the length of the main filament 44. On the other hand, if the length of the main filament 42 is too large, it becomes difficult for the main filament 42 to pass between the teeth. From this point of view, it is preferable that the length of the main filament 42 is not more than three times the length of the main filament 44.

  The main filament 42 has the maximum length among the plurality of main filaments. The main filament 44 has the minimum length among the plurality of main filaments. Thereby, it becomes easy to take a large difference in length between the main filament 42 and the main filament 44. However, it is not essential that the main filament 42 has the maximum length, and it is not essential that the main filament 44 has the minimum length.

The sub filament 42 a is provided on the main filament 42. By providing the sub-filament 42a on the main filament 42 in this way, the sub-filament 42a can be brought into contact with the back side of the tooth when the brush portion 40 is pulled forward. For this reason, the plaque near the back surface of the tooth can be effectively removed. Other effects of the interdental brush 2 are the same as those of the interdental brush 1.
(Third embodiment)

  FIG. 5 is a side view showing a third embodiment of the interdental brush according to the present invention. The interdental brush 3 includes a handle portion 10, a core portion 20, and a brush portion 50. The configurations of the handle 10 and the core 20 are as described in the first embodiment.

  The brush part 50 has a plurality of filaments (main filaments) extending from the core part 20 in a direction intersecting with the extending direction of the core part 20. The brush part 50 includes n filament bundles (n is an integer of 3 or more) composed of a group of main filaments continuous along the extending direction of the core part 20. In the present embodiment, n is an integer of 4 or more, specifically, n = 8. The plurality of main filaments belong to any filament bundle. In FIG. 5, each filament bundle is represented by a single line.

  FIG. 6 is an enlarged view showing the brush portion 50 in FIG. Each filament bundle is composed of a plurality of main filaments. In each filament bundle, adjacent main filaments are in contact with each other (however, in FIG. 6, a gap is provided between adjacent main filaments for the sake of clarity).

  Of the filament bundles, the distance d1 (first distance) between the filament bundle 53 (first filament bundle) closest to the tip 20a of the core portion 20 and the adjacent filament bundle is the average distance of n filament bundles. Wider than. The interval d1 is equal to the maximum interval of n filament bundles.

  Similarly, an interval d2 (second interval) between the filament bundle 57 (second filament bundle) closest to the rear end 20b of the core portion 20 in the filament bundle and the adjacent filament bundle is n filaments. Wider than the average spacing of the bundles. The interval d2 is also equal to the maximum interval of n filament bundles. That is, in the present embodiment, the interval d2 is equal to the interval d1. An interval d3 between filament bundles other than the filament bundles 53 and 57 is constant. Regarding the interval d1, the interval d2, and the interval d3, the relationship d1 = d2> d3 is established.

  The average interval is defined as the arithmetic average of the intervals between adjacent filament bundles for all the filament bundles constituting the brush unit 50. Specifically, in the present embodiment, the average interval d0 = (d1 + d2 + d3 × 5) / 7.

  The brush part 50 has the subfilament 52a. The sub filament 52a extends from the side surface of at least one main filament in a direction intersecting with the extending direction of the main filament. The sub-filament 52a is provided only on some of the main filaments. In this embodiment, the subfilament 52a is provided on the main filament belonging to the filament bundle 53 and the main filament belonging to the filament bundle 57 (however, the subfilament 52a is not shown in FIG. 6). . The subfilament 52a may be provided only on these main filaments, or may be provided on other main filaments. The structure of the subfilament 52a is the same as that of the subfilament 32a (see FIG. 2). The other configuration of the brush unit 50 is the same as that of the brush unit 30 described in the first embodiment.

  The effect of the interdental brush 3 will be described. In the interdental brush 3, the brush part 50 has a subfilament 52a in addition to the main filament. The sub filament 52a extends from the side surface of at least one main filament in a direction intersecting with the extending direction of the main filament. By providing the subfilament 52a on the side surface of the main filament in this way, even if the tip of the main filament does not hit the surrounding teeth, the tip of the subfilament 52a hits the tooth. Can do. Thereby, the plaque can be removed by scraping with the subfilament 52a. For this reason, compared with the case where the subfilament 52a is not provided, the plaque removal capability is improved. Therefore, the interdental brush 3 having excellent plaque removal capability is realized.

  The interval (first interval) between the filament bundle 53 that is the filament bundle closest to the tip 20a of the core portion 20 and the adjacent filament bundle is wider than the average interval of all the filament bundles. By widening the first interval in this way, the main filament belonging to the filament bundle 53 is likely to fall. Thereby, when inserting the brush part 50 between teeth, the resistance which the brush part 50 receives from the tooth | gear around a tooth | gear can be restrained small. For this reason, it becomes easy to insert the brush part 50 between teeth.

  The interval (second interval) between the filament bundle 57 which is the filament bundle closest to the rear end 20b of the core portion 20 and the adjacent filament bundle is wider than the average interval of all the filament bundles. By widening the second interval in this way, the main filament belonging to the filament bundle 57 is likely to fall down. Thereby, when pulling the brush part 50 to the front, the resistance which the brush part 50 receives from the tooth | gear around a tooth | gear can be restrained small. For this reason, it becomes easy to pull out the brush part 50 from between teeth.

  Each main filament constitutes a filament bundle. By configuring the filament bundle in this way, sufficient rigidity can be secured for the entire filament bundle without increasing the thickness of each main filament. In the first and second embodiments, each main filament may constitute a filament bundle. Other effects of the interdental brush 3 are the same as those of the interdental brush 1.

  The present invention is not limited to the above embodiment, and various modifications can be made. In the said embodiment, the case where the length of the some main filament 32 which comprises the brush part 30 was constant was illustrated. However, as shown in FIG. 7, the length of the plurality of main filaments 32 may gradually increase from the front end 20a of the core portion 20 toward the rear end 20b. Thus, it becomes easy to insert the brush part 30 between teeth by making the brush part 30 whole into a tapered shape. The same applies to the plurality of main filaments constituting the brush portion 40 (limited to those in the section from the main filament 44 to the main filament 46) and the plurality of main filaments constituting the brush portion 50.

  Further, as shown in FIG. 8, the lengths of the plurality of main filaments 32 gradually increase from the tip 20a of the core 20 toward the center and gradually decrease from the center of the core 20 toward the rear end 20b. It may be. Here, “the center of the core part 20” refers to an arbitrary point existing between the front end 20 a and the rear end 20 b in the core part 20. In the figure, the subfilament 32a is provided on the main filament 32 (the main filament 32 having the maximum length) located at the center of the core portion 20. Thus, by making the both ends of the brush part 30 into a taper shape, while becoming easy to insert the brush part 30 between teeth, it becomes easy to pull out the brush part 30 from between teeth. The same applies to the plurality of main filaments constituting the brush portion 40 (limited to those in the section from the main filament 44 to the main filament 46) and the plurality of main filaments constituting the brush portion 50.

  In the said embodiment, the case where the subfilament was provided only in the one part main filament was illustrated. However, the subfilament may be provided on all main filaments.

  In the said embodiment, the case where the extension direction of the main filament crossed the extension direction of the core part 20 at substantially right angle was illustrated. However, the extending direction of the main filament may intersect the extending direction of the core part 20 at an acute angle or an obtuse angle.

  In the said embodiment, the case where the extension direction of a subfilament crossed the extension direction of the main filament at substantially right angle was illustrated. However, the extension direction of the subfilament may intersect with the extension direction of the main filament at an acute angle or an obtuse angle.

  In the said embodiment, the case where the length of a some subfilament became gradually large as it went to the front-end | tip from the rear end of the main filament was illustrated. However, the mutual relationship between the lengths of the plurality of subfilaments is arbitrary. For example, the length of the plurality of subfilaments may be constant.

  In the said embodiment, the case where the vicinity of the front-end | tip 10a of the handle | pattern part 10 was bent was illustrated. However, the entire handle portion 10 may be straight.

DESCRIPTION OF SYMBOLS 1 Interdental brush 2 Interdental brush 3 Interdental brush 10 Handle part 10a Front end 20 Core part 20a Front end 20b Rear end 30 Brush part 32 Main filament 32a Subfilament 32b Front end 32c Rear end 40 Brush part 42 Main filament (first main filament)
42a Subfilament 44 Main filament (second main filament)
46 Main filament 50 Brush portion 52a Sub filament 53 Filament bundle (first filament bundle)
57 Filament bundle (second filament bundle)

Claims (24)

The handle,
A core extending linearly from the handle,
A brush part having a plurality of main filaments extending in a direction intersecting with the extending direction of the core part from the core part,
The brush portion has at least one side of the main filaments have a secondary filaments extending in a direction intersecting the extending direction of the main filaments,
The interdental brush , wherein the thickness of the subfilament is smaller than the thickness of the main filament . The interdental brush according to claim 1,
An interdental brush in which the extension direction of the subfilament intersects with the extension direction of the main filament at a substantially right angle. The interdental brush according to claim 1 or 2,
An interdental brush in which a plurality of subfilaments are provided for one main filament. The interdental brush according to claim 3,
The plurality of subfilaments are interdental brushes provided over a plurality of locations in the extending direction of the main filament. The interdental brush according to claim 4,
The interdental brush in which the lengths of the plurality of subfilaments gradually increase from the rear end to the front end of the main filament. In the interdental brush in any one of Claims 1 thru | or 5 ,
The subfilament is an interdental brush made of the same material as the main filament. The interdental brush according to any one of claims 1 to 6 ,
The subfilament is an interdental brush formed by fluffing the side surface of the main filament. The interdental brush according to any one of claims 1 to 7 ,
The subfilament is an interdental brush provided on a main filament having a maximum length among the plurality of main filaments. The interdental brush according to any one of claims 1 to 8 ,
The subfilament is an interdental brush provided only on a part of the plurality of main filaments. The interdental brush according to claim 9 ,
The interdental brush whose ratio of the main filament provided with the said subfilament to the whole said several main filament is 20% or less. The interdental brush according to any one of claims 1 to 10 ,
The interdental brush in which the lengths of the plurality of main filaments are constant. The interdental brush according to any one of claims 1 to 10 ,
The interdental brush in which the lengths of the plurality of main filaments gradually increase from the front end to the rear end of the core portion. The interdental brush according to claim 11 or 12 ,
The subfilament is an interdental brush provided on a main filament closest to a rear end of the core portion among the plurality of main filaments. The interdental brush according to any one of claims 1 to 10 ,
An interdental brush in which the lengths of the plurality of main filaments gradually increase from the tip of the core toward the center and gradually decrease from the center to the rear end of the core. The interdental brush according to any one of claims 1 to 10 ,
The plurality of main filaments have a first main filament that is the main filament closest to the tip of the core, a length smaller than the first main filament, and the first main filament is closest to the first main filament. A second main filament that is a near main filament,
An interdental brush in which the length of the first main filament is larger than the average length of the plurality of main filaments. The interdental brush according to claim 15 ,
The sub-filament is an interdental brush provided on the first main filament. The interdental brush according to claim 15 or 16 ,
The first main filament is an interdental brush having a maximum length among the plurality of main filaments. The interdental brush according to any one of claims 15 to 17 ,
The second main filament is an interdental brush having a minimum length among the plurality of main filaments. The interdental brush according to any one of claims 1 to 18 ,
The brush part includes n filament bundles (n is an integer of 3 or more) composed of a group of the main filaments continuous along the extending direction of the core part,
When the filament bundle closest to the tip of the core of the filament bundle is the first filament bundle,
An interdental brush in which a first interval, which is an interval between the first filament bundle and a filament bundle adjacent to the first filament bundle, is wider than an average interval of the n filament bundles. The interdental brush according to claim 19 ,
The subfilament is an interdental brush provided on the main filament belonging to the first filament bundle. The interdental brush according to claim 19 or 20 ,
The first interval is an interdental brush that is equal to the maximum interval of the n filament bundles. The interdental brush according to any one of claims 19 to 21 ,
N is an integer of 4 or more;
When the filament bundle closest to the rear end of the core portion of the filament bundle is the second filament bundle,
An interdental brush in which a second interval, which is an interval between the second filament bundle and a filament bundle adjacent to the second filament bundle, is wider than the average interval. The interdental brush according to claim 22 ,
The subfilament is an interdental brush provided on the main filament belonging to the second filament bundle. The interdental brush according to claim 22 or 23 ,
The second interval is an interdental brush equal to the maximum interval of the n filament bundles.

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