WO2018042619A1

WO2018042619A1 - Toothbrush

Info

Publication number: WO2018042619A1
Application number: PCT/JP2016/075794
Authority: WO
Inventors: 伊藤　博
Original assignee: 株式会社無有
Priority date: 2016-09-02
Filing date: 2016-09-02
Publication date: 2018-03-08
Also published as: JP6205503B1; JPWO2018042619A1

Abstract

Provided is a toothbrush capable of simultaneously brushing both side faces of a tooth. This toothbrush 1 is provided with a head 10. The head 10 comprises a brush base 12 and a brush part 14. The brush part 14 comprises a plurality of filaments implanted on a bristle implantation surface of the brush base 12. The brush part 14 is provided with a gap part 20. The gap 20 extends from end to end of the brush part 14 in a first direction and has such a width d1 that a tooth can be sandwiched from both sides. The plurality of filaments include gap-side filaments 22 that stand along both sides of the gap part 20.

Description

toothbrush

The present invention relates to a toothbrush.

As a conventional toothbrush, for example, there is one described in Patent Document 1. The toothbrush described in the document includes a head, a handle, and a neck that connects the head and the handle. The head has a flat brush base and a brush portion formed of a plurality of filament bundles. A plurality of flocked holes are formed on one surface (flocked surface) of the brush base. A filament bundle constituting the brush portion is implanted in each flock hole.

JP 2013-118944 A

In the above-described toothbrush, due to the structure of the brush part, it is difficult to simultaneously apply the filament to both the outer side surface (lip side surface, cheek side surface) and inner side surface (lingual side surface, palate side surface) of the tooth. Therefore, the outer and inner surfaces of the teeth must be polished separately. This is one of the factors that make brushing feel bothersome.

The present invention has been made in view of the above problems, and an object thereof is to provide a toothbrush capable of simultaneously polishing both side surfaces of a tooth.

A toothbrush according to the present invention includes a head having a brush base and a brush portion made of a plurality of filaments planted on a flocking surface of the brush base, and the brush portion has the brush along a first direction. A first gap portion extending from end to end and having a width capable of sandwiching teeth from both side surfaces is provided, and the plurality of filaments extend along both sides of the first gap portion. And including a first filament along the gap.

In this toothbrush, the brush portion is provided with a first gap portion capable of sandwiching teeth from both side surfaces. By sandwiching the teeth in the first gap portion, it is possible to simultaneously apply a filament (first gap-aligned filament) to both side surfaces of the teeth. This makes it possible to polish both sides of the tooth simultaneously.

According to the present invention, a toothbrush capable of simultaneously polishing both sides of a tooth is realized.

It is a top view which shows 1st Embodiment of the toothbrush by this invention. It is a front view which shows the toothbrush of FIG. It is a side view which shows the toothbrush of FIG. It is a figure for demonstrating the usage method of the toothbrush of FIG. It is a figure for demonstrating the usage method of the toothbrush of FIG. It is a top view which shows 2nd Embodiment of the toothbrush by this invention. It is a front view which shows the toothbrush of FIG. It is a side view which shows the toothbrush of FIG. It is a figure for demonstrating the usage method of the toothbrush of FIG. It is a figure for demonstrating the usage method of the toothbrush of FIG. It is a figure for demonstrating the modification of the gap along filament 22. It is a figure for demonstrating the modification of the gap along filament 32. FIG.

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 plan view showing a first embodiment of a toothbrush according to the present invention. Moreover, FIG.2 and FIG.3 is the front view and side view which respectively show the toothbrush of FIG. FIG. 2 is a view of the toothbrush of FIG. 1 viewed from the distal end side (right side of FIG. 1).

The toothbrush 1 includes a head 10. The head 10 has a brush base 12 and a brush portion 14. The brush base 12 is connected to a handle 44 through a neck 42. The neck 42 and the handle 44 have an elongated shape. The neck 42 is formed thinner than any of the brush base 12 and the handle 44. The handle 44 is a part that the user of the toothbrush 1 has by hand. The brush base 12, the neck 42, and the handle 44 are aligned on a straight line in plan view. As a material for the brush base 12, the neck 42, and the handle 44, for example, plastic such as polypropylene can be used. 1 and 3, a part of the handle 44 is not shown.

The brush base 12 has a plate shape, and its upper surface is a flocking surface. The brush base 12 has a vertically long shape in plan view. Here, the longitudinal direction of the brush base 12 is equal to the extending direction of the neck 42 and the handle 44 (left-right direction in FIG. 1), and the horizontal direction of the brush base 12 is the width direction of the neck 42 and the handle 44 (up-down direction in FIG. 1). )be equivalent to. The length of the brush base 12 in the vertical direction is, for example, about 15 to 30 mm. The horizontal length of the brush base 12 is, for example, about 10 to 20 mm. The thickness of the brush base 12 is, for example, about 2 to 5 mm.

The brush part 14 consists of a plurality of filaments planted on the flocked surface of the brush base 12. In the following description, “a plurality of filaments” refers to all the filaments constituting the brush portion 14 unless otherwise specified. The thickness of each filament is, for example, about 1 to 10 mil (1 mil = 0.0254 mm). The length of each filament is about 10 to 20 mm. As a material of the brush part 14, for example, nylon can be used.

The brush part 14 is provided with a gap part 20 (first gap part). The gap portion 20 extends from end to end of the brush portion 14 along the first direction. The first direction is a direction parallel to the flocked surface of the brush base 12. In the present embodiment, the first direction is equal to the vertical direction of the brush base 12. Therefore, the gap portion 20 is provided so as to cut the brush portion 14 vertically.

The gap portion 20 has a width d1 that allows the teeth to be sandwiched from both side surfaces (outer surface and inner surface). The width d1 is defined as the width of the largest rectangular parallelepiped (indicated by the dotted line L1 in FIGS. 1 and 2) that can be accommodated in the gap 20. The height of the upper surface of the rectangular parallelepiped coincides with the height of the tip of the gap-side filament 22 described later. The width d1 is, for example, not less than 2 mm and not more than 5 mm. No filament is provided in a region overlapping the gap 20 in plan view.

The brush portion 14 is also provided with a gap portion 30 (second gap portion). The gap portion 30 extends from end to end of the brush portion 14 along a second direction that intersects the first direction. The second direction is a direction parallel to the flocked surface of the brush base 12. In the present embodiment, the second direction is orthogonal to the first direction and is equal to the lateral direction of the brush base 12. Therefore, the gap portion 30 is provided so as to cross the brush portion 14. The gap portion 20 and the gap portion 30 intersect at a substantially central portion of the brush portion 14 in plan view. Thus, a cross-shaped gap composed of the gap 20 and the gap 30 exists in the brush portion 14.

The gap portion 30 has a width d2 that allows the teeth to be sandwiched from both side surfaces. The width d2 is defined as the width of the largest cuboid (indicated by the dotted line L2 in FIGS. 1 and 3) that can be accommodated in the gap 30. The height of the upper surface of the rectangular parallelepiped coincides with the height of the tip of the gap-side filament 32 described later. However, the width d2 is smaller than the width d1. Thus, the width d1 of the gap 20 and the width d2 of the gap 30 are different from each other. The width d2 is, for example, 1 mm or more and 3 mm or less. No filament is provided in a region overlapping the gap 30 in plan view.

The plurality of filaments includes a gap-side filament 22 (first gap-side filament) and a gap-side filament 32 (second gap-side filament). A plurality of gap-side filaments 22 and gap-side filaments 32 exist. The gap-side filament 22 (see FIG. 2) stands along both sides of the gap portion 20. That is, the filament facing the gap 20 among the plurality of filaments is the gap-side filament 22. The gap-side filaments 22 are arranged in parallel with the side surface of the rectangular parallelepiped indicated by the dotted line L1 in plan view. Specifically, the gap along filaments 22 on one side of the gap 20 are aligned along one side of the rectangular parallelepiped. Further, the gap-side filaments 22 on the other side of the gap portion 20 are aligned on the other side surface of the rectangular parallelepiped.

The gap-side filament 32 (see FIG. 3) stands along both sides of the gap 30. That is, among the plurality of filaments, the filament facing the gap 30 is the gap-side filament 32. The gap-side filaments 32 are arranged in parallel with the side surface of the rectangular parallelepiped indicated by the dotted line L2 in plan view. Specifically, the gap-side filaments 32 on one side of the gap portion 30 are aligned along one side surface of the rectangular parallelepiped. Further, the gap-side filaments 32 on the other side of the gap 30 are aligned on the other side surface of the rectangular parallelepiped.

The brush part 14 includes n (n is an integer of 2 or more) filament bundles. In the present embodiment, n = 32 as can be seen from FIG. Each filament bundle consists of m filaments (m is an integer of 2 or more). The value of m is about 10 to 40, for example. The plurality of filaments belong to any filament bundle. In FIG. 1, each filament bundle is represented by a single circle. In each filament bundle, adjacent filaments are in contact with each other. The filament bundles are separated from each other. Specifically, n flocked holes are formed on the flocked surface of the brush base 12, and one filament bundle is implanted in one flocked hole.

An example of how to use the toothbrush 1 will be described with reference to FIGS. In both figures, the left side is the outer surface of the tooth 90, and the right side is the inner surface of the tooth 90. Here, the back teeth (molar teeth) are shown as examples of the teeth 90.

As shown in FIG. 4, the teeth 90 are sandwiched from both sides by the gap portion 20 so that the occlusal surface of the teeth 90 faces the flocked surface of the brush base 12. At this time, the flocked surface of the brush base 12 is substantially perpendicular to the vertical direction of the teeth 90. Side surfaces of the gap-side filament 22 are in contact with both side surfaces of the tooth 90. The tip of the gap-side filament 22 reaches the gingiva 92. In this way, the tip of the gap-side filament 22 contacts the gingiva 92 with the teeth sandwiched in the gap portion 20. In this state, the tooth 90 can be brushed by reciprocating the head 10 in the first direction (direction perpendicular to the paper surface in FIG. 4).

Similarly, as shown in FIG. 5, the teeth 90 are sandwiched from both sides by the gap 30. Side surfaces of the gap-side filament 32 are in contact with both side surfaces of the tooth 90. The tip of the gap filament 32 reaches the gingiva 92. In this way, the tip of the gap-side filament 32 contacts the gingiva 92 in a state where the teeth are sandwiched in the gap portion 30. In this state, the tooth 90 can be brushed by reciprocating the head 10 in the second direction (direction perpendicular to the paper surface in FIG. 5).

The effect of the toothbrush 1 will be described. In the toothbrush 1, the brush portion 14 is provided with a gap portion 20 capable of sandwiching teeth from both side surfaces. By sandwiching the teeth in the gap 20, the filament (gap along the gap 22) can be simultaneously applied to both side surfaces of the teeth. This makes it possible to polish both sides of the tooth simultaneously. Therefore, the toothbrush 1 which can polish both sides of a tooth simultaneously is implement | achieved.

The toothbrush 1 is configured such that the gap-side filament 22 contacts the gingiva in a state where teeth are sandwiched in the gap portion 20. Thereby, when brushing both sides of a tooth, cleaning in a periodontal pocket and massage of a gingiva can be performed simultaneously. However, it is not essential to configure the toothbrush 1 so that the gap-side filament 22 contacts the gingiva.

The brush base 12 has a vertically long shape in plan view, and the extending direction (first direction) of the gap 20 is equal to the vertical direction of the brush base 12. By making the extending direction of the gap 20 coincide with the longitudinal direction of the brush base 12 in this way, the head 10 can be easily reciprocated with the back teeth sandwiched by the gap 20.

The brush part 14 is also provided with a gap part 30 capable of sandwiching teeth from both side surfaces. By sandwiching the teeth in the gap 30, the filament (gap along the gap 32) can be simultaneously applied to both side surfaces of the teeth. As described above, since a plurality of gaps (gap 20 and gap 30) are provided, it is possible to select an optimum gap according to the position of the teeth. However, providing the gap 30 is not essential.

The width d1 of the gap 20 and the width d2 of the gap 30 are different from each other. Thereby, it becomes possible to select an optimal gap | interval part according to the magnitude | size of a tooth | gear. For example, it is also conceivable to use the gap 20 for the back teeth and use the gap 30 for the front teeth.

The toothbrush 1 is configured such that the gap-side filament 32 contacts the gingiva in a state where the teeth are sandwiched in the gap portion 30. Thereby, when brushing both sides of a tooth, cleaning in a periodontal pocket and massage of a gingiva can be performed simultaneously. However, it is not essential to configure the toothbrush 1 so that the gap-side filament 32 contacts the gingiva.
(Second Embodiment)

FIG. 6 is a plan view showing a second embodiment of the toothbrush according to the present invention. 7 and 8 are a front view and a side view, respectively, showing the toothbrush of FIG. FIG. 7 is a view of the toothbrush of FIG. 6 as viewed from the distal end side (right side of FIG. 6).

The toothbrush 2 includes a head 10. The head 10 has a brush base 12 and a brush portion 14. The brush part 14 consists of a plurality of filaments planted on the flocked surface of the brush base 12. The brush portion 14 is provided with a gap portion 20 and a gap portion 30.

In the present embodiment, the plurality of filaments include a sub-gap filament 24 (first sub-gap filament) and a sub-gap filament 34 (second sub-gap filament) in addition to the inter-gap filament 22 and the inter-gap filament 32. It is out. A plurality of sub-gap filaments 24 and sub-gap filaments 34 exist. The under-gap filament 24 is provided in a region that overlaps the gap 20 in plan view. That is, the under-gap filament 24 is implanted in a region that overlaps the gap 20 in plan view on the flocked surface of the brush base 12. The length of the under-gap filament 24 is smaller than the length of the gap-side filament 22. The length of the under-gap filament 24 is preferably less than or equal to one-half of the length of the gap-side filament 22, and more preferably less than or equal to one-fourth.

The under-gap filament 34 is provided in a region overlapping the gap 30 in plan view. That is, the under-gap filament 34 is implanted in a region that overlaps the gap 30 in plan view on the flocked surface of the brush base 12. The length of the inter-gap filament 34 is smaller than the length of the inter-gap filament 32. The length of the inter-gap filament 34 is preferably half or less of the length of the gap-side filament 32, and more preferably one-quarter or less. In FIG. 6, a filament bundle composed of the inter-gap filament 24 or the inter-gap filament 34 is represented by a black circle, and a filament bundle composed of other filaments is represented by a white circle. The filament present in the region where the gap 20 and the gap 30 intersect serves as both the under-gap filament 24 and the under-gap filament 34. Other configurations of the toothbrush 2 are the same as those of the toothbrush 1.

An example of how to use the toothbrush 2 will be described with reference to FIGS. 9 and 10. In both figures, the left side is the outer surface of the tooth 90, and the right side is the inner surface of the tooth 90.

As shown in FIG. 9, the teeth 90 are sandwiched from both sides by the gap portion 20 so that the occlusal surface of the teeth 90 faces the flocked surface of the brush base 12. Side surfaces of the gap-side filament 22 are in contact with both side surfaces of the tooth 90. The tip of the gap-side filament 22 reaches the gingiva 92. Further, the tip of the under-gap filament 24 is in contact with the occlusal surface of the tooth 90. In this state, the tooth 90 can be brushed by reciprocating the head 10 in the first direction (direction perpendicular to the paper surface in FIG. 9).

Similarly, as shown in FIG. 10, the teeth 90 are sandwiched from both sides by the gap 30. Side surfaces of the gap-side filament 32 are in contact with both side surfaces of the tooth 90. The tip of the gap filament 32 reaches the gingiva 92. Further, the tip of the sub-gap filament 34 is in contact with the vicinity of the tip of the tooth 90. In this state, the tooth 90 can be brushed by reciprocating the head 10 in the second direction (direction perpendicular to the paper surface in FIG. 10).

The effect of the toothbrush 2 will be described. The plurality of filaments includes a sub-gap filament 24. In this case, the interstitial filament 24 can be applied to the occlusal surface of the back tooth or the vicinity of the tip of the front tooth with the teeth sandwiched in the gap portion 20. This makes it possible to polish not only the side surfaces of the teeth but also the occlusal surfaces at the same time.

By sufficiently reducing the length of the under-gap filament 24 with respect to the gap-side filament 22, the height of the gap 20 can be ensured to be large. By increasing the height of the gap 20, the tip of the gap-side filament 22 can easily reach the gingiva. From this point of view, the length of the interstitial filament 24 is preferably less than or equal to one-half of the length of the inter-gap filament 22 and more preferably less than or equal to one-fourth.

The plurality of filaments includes a sub-gap filament 34. In this case, the interstitial filament 34 can be applied to the occlusal surface of the teeth while the teeth are sandwiched between the gaps 30. This makes it possible to polish not only the side surfaces of the teeth but also the occlusal surfaces at the same time.

By sufficiently reducing the length of the under-gap filament 34 with respect to the gap-side filament 32, the height of the gap 30 can be ensured to be large. By increasing the height of the gap 30, the tip of the gap-side filament 32 can easily reach the gingiva. From this viewpoint, the length of the inter-gap filament 34 is preferably half or less of the length of the gap-side filament 32, and more preferably one-quarter or less. Other effects of the toothbrush 2 are the same as those of the toothbrush 1.

The present invention is not limited to the above embodiment, and various modifications are possible. As shown in FIG. 11, the gap-side filament 22 may have a main filament portion 22a and a sub-filament portion 22b. The main filament portion 22 a is a portion extending from the brush base 12. In the said embodiment, the case where the gap along filament 22 consisted only of the main filament part 22a was illustrated. The sub filament portion 22b extends from the side surface of the main filament portion 22a toward the gap portion 20. A plurality of sub-filament portions 22b are provided for one main filament portion 22a. The plurality of sub-filament portions 22b are provided over a plurality of locations in the extending direction of the main filament portion 22a. The thickness of each subfilament part 22b is smaller than the thickness of the main filament part 22a. The sub-filament part 22b is preferably made of the same material as the main filament part 22a. The subfilament part 22b can be formed, for example, by fluffing the side surface of the main filament part 22a.

By providing the sub-filament part 22b, the tip of the sub-filament part 22b can be applied to both side surfaces of the tooth in a state where the tooth is sandwiched in the gap part 20. Thereby, it becomes easy to remove the plaque adhering to both side surfaces of the tooth. Since a plurality of subfilament portions 22b are provided for one main filament portion 22a, the ability to remove plaque can be improved as compared with the case where only one subfilament portion 22b is provided. . Since the plurality of subfilament portions 22b are provided at a plurality of locations in the extending direction of the main filament portion 22a, the subfilament portions 22b can reach a wide range of teeth. This also contributes to an improvement in plaque removal ability.

The thickness of the sub filament part 22b is smaller than the thickness of the main filament part 22a. Thus, reducing the thickness of the subfilament portion 22b in contact with the teeth is advantageous in improving the plaque removal capability. When the sub filament part 22b consists of the same material as the main filament part 22a, it becomes possible to form the sub filament part 22b by processing the side surface of the main filament part 22a. This is advantageous for forming the subfilament portion 22b at a low cost. When the sub filament part 22b is formed by fluffing the side surface of the main filament part 22a, the formation cost of the sub filament part 22b can be suppressed particularly low.

Further, the vicinity of the tip of the gap-side filament 22 (main filament portion 22a) may be bent toward the gap portion 20, as shown in FIG. The bending angle α near the tip of the gap-side filament 22 is preferably 0 <α <90 °, and particularly preferably 30 ° <α <60 °. With this configuration, the tip of the gap-side filament 22 easily enters the periodontal pocket in a state where the teeth are sandwiched in the gap portion 20.

Similarly, the gap-side filament 32 may have a main filament part 32a and a sub-filament part 32b as shown in FIG. The main filament portion 32 a is a portion extending from the brush base 12. In the said embodiment, the case where the gap along filament 32 consisted only of the main filament part 32a was illustrated. The sub filament portion 32b extends from the side surface of the main filament portion 32a toward the gap portion 30. A plurality of sub-filament portions 32b are provided for one main filament portion 32a. The plurality of sub-filament portions 32b are provided over a plurality of locations in the extending direction of the main filament portion 32a. The thickness of each subfilament part 32b is smaller than the thickness of the main filament part 32a. The sub filament portion 32b is preferably made of the same material as the main filament portion 32a. The sub filament part 32b can be formed, for example, by fluffing the side surface of the main filament part 32a.

By providing the sub-filament part 32b, the tip of the sub-filament part 32b can be applied to both side surfaces of the tooth in a state where the tooth is sandwiched in the gap part 30. Thereby, it becomes easy to remove the plaque adhering to both side surfaces of the tooth. Since a plurality of subfilament portions 32b are provided for one main filament portion 32a, the plaque removing ability can be improved as compared with the case where only one subfilament portion 32b is provided. . Since the plurality of subfilament portions 32b are provided at a plurality of locations in the extending direction of the main filament portion 32a, the subfilament portions 32b can reach a wide range of teeth. This also contributes to an improvement in plaque removal ability.

The thickness of the sub filament part 32b is smaller than the thickness of the main filament part 32a. Thus, reducing the thickness of the subfilament portion 32b in contact with the teeth is advantageous in improving the plaque removal capability. When the subfilament part 32b consists of the same material as the main filament part 32a, it becomes possible to form the subfilament part 32b by processing the side surface of the main filament part 32a. This is advantageous for forming the subfilament portion 32b at a low cost. When the sub filament part 32b is formed by fluffing the side surface of the main filament part 32a, the formation cost of the sub filament part 32b can be suppressed particularly low.

Further, the vicinity of the tip of the gap-side filament 32 (main filament part 32a) may be bent toward the gap part 30, as shown in FIG. The bending angle β near the tip of the gap-side filament 32 is preferably 0 <β <90 °, and particularly preferably 30 ° <β <60 °. With such a configuration, the tip of the gap-side filament 32 can easily enter the periodontal pocket in a state where the teeth are sandwiched in the gap portion 30.

In the above-described embodiment, the case where the brush base 12 has a vertically long shape in plan view is illustrated. However, the brush base 12 may have a horizontally long shape in plan view. Alternatively, the vertical length and the horizontal length of the brush base 12 may be equal to each other.

In the above embodiment, the case where the width of the gap 30 is smaller than the width of the gap 20 is exemplified. However, the width of the gap 30 may be larger than the width of the gap 20 or may be equal to the width of the gap 20.

In the above embodiment, a manual type toothbrush is illustrated. However, the toothbrush according to the present invention may be an electric toothbrush.

DESCRIPTION OF SYMBOLS 1 Toothbrush 2 Toothbrush 10 Head 12 Brush stand 14 Brush part 20 Gap part (1st gap part)
22 Gap along the filament (first gap along the filament)
22a Main filament portion 22b Subfilament portion 24 Interstitial filament (first interstitial filament)
30 Gap (second gap)
32 Gap along the filament (second gap along the filament)
32a Main filament part 32b Subfilament part 34 Interstitial filament (second interstitial filament)
42 Neck 44 Handle 90 Teeth 92 Gingiva

Claims

A head having a brush base and a brush portion made of a plurality of filaments planted on the flocking surface of the brush base;
The brush portion is provided with a first gap portion extending in a first direction from end to end of the brush portion and having a width capable of sandwiching teeth from both side surfaces,
The toothbrush characterized in that the plurality of filaments include first gap-aligned filaments that stand along both sides of the first gap portion.
The toothbrush according to claim 1,
A toothbrush configured such that the first gap-side filament contacts the gingiva in a state where teeth are sandwiched between the first gap portions.
The toothbrush according to claim 1 or 2,
A toothbrush in which the vicinity of the tip of the first gap-side filament is bent toward the first gap portion.
The toothbrush according to any one of claims 1 to 3,
The brush stand has a vertically long shape in plan view,
The first direction is a toothbrush that is equal to the longitudinal direction of the brush base.
The toothbrush according to any one of claims 1 to 4,
The first interstitial filament is
A main filament portion extending from the brush base;
A toothbrush having a subfilament portion extending from a side surface of the main filament portion toward the first gap portion.
The toothbrush according to claim 5,
A toothbrush in which a plurality of sub-filament parts are provided for one main filament part.
The toothbrush according to claim 6,
The plurality of subfilament portions are toothbrushes provided at a plurality of locations in the extending direction of the main filament portion.
The toothbrush according to any one of claims 5 to 7,
A toothbrush in which the thickness of the sub-filament part is smaller than the thickness of the main filament part.
The toothbrush according to any one of claims 5 to 8,
The sub-filament part is a toothbrush made of the same material as the main filament part.
The toothbrush according to any one of claims 5 to 9,
The subfilament portion is a toothbrush formed by fluffing the side surface of the main filament portion.
The toothbrush according to any one of claims 1 to 10,
The plurality of filaments are toothbrushes including a first sub-gap filament planted in a region overlapping the first gap portion in plan view on the flocked surface.
The toothbrush according to claim 11,
The length of the first sub-gap filament is a toothbrush that is less than or equal to one-half of the length of the first gap-side filament.
The toothbrush according to claim 12,
The length of the first sub-gap filament is a toothbrush that is not more than a quarter of the length of the first gap-side filament.
The toothbrush according to any one of claims 1 to 13,
The brush portion has a second gap extending from end to end along the second direction intersecting the first direction and having a width capable of sandwiching teeth from both side surfaces. Part is provided,
The plurality of filaments are toothbrushes including second gap-side filaments that stand along both sides of the second gap portion.
The toothbrush according to claim 14,
The toothbrush in which the second direction is orthogonal to the first direction.
The toothbrush according to claim 14 or 15,
The width of the first gap and the width of the second gap are toothbrushes different from each other.
The toothbrush according to any one of claims 14 to 16,
A toothbrush configured such that the second gap-side filament contacts the gingiva in a state where teeth are sandwiched in the second gap portion.
The toothbrush according to any one of claims 14 to 17,
A toothbrush in which the vicinity of the tip of the second gap-side filament is bent toward the second gap portion.
The toothbrush according to any one of claims 14 to 18,
The second gap filament is
A main filament portion extending from the brush base;
A toothbrush having a subfilament portion extending from a side surface of the main filament portion toward the second gap portion.
The toothbrush according to any one of claims 14 to 19,
The plurality of filaments are toothbrushes including second interstitial filaments planted in a region overlapping the second gap portion in plan view on the flocked surface.