JP2018140088A - Interdental cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interdental cleaner which can prevent a shaft part from breaking during interdental cleaning and can reduce stimulation of gums.SOLUTION: The interdental cleaner comprises: a base part (10) comprising a shaft part (20) and a grip part (30); and a cleaning part (40). A dimension of the grip part (30) in a second direction is greater than a dimension of the grip part (30) in a first direction. A dimension (L1) of the shaft part (20) in a direction parallel to the first direction is greater than a dimension (L2) of the shaft part (20) in a direction parallel to the second direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an interdental cleaning tool.

  Conventionally, an interdental cleaning tool for cleaning between teeth is known. For example, Patent Document 1 discloses an interdental cleaning tool including a base portion having a shape extending in a specific direction and a cleaning portion made of an elastomer. The base has a shaft portion that can be inserted between teeth and has a shape that extends linearly, and a grip portion that has a shape that can be gripped by a finger. A cross section of the shaft portion (a cross section in a plane orthogonal to the axial direction of the shaft portion) is circular. The grip part is connected to the shaft part and formed flat. A cleaning part is a site | part for cleaning between teeth, and has a shape which coat | covers a part of outer peripheral surface of a axial part.

International Publication No. 2013/176297

  When the interdental cleaning tool as described in Patent Document 1 is used to clean the interdental space between the back teeth (molar teeth), the shaft may be broken or the stimulation to the gums may increase. Specifically, cleaning between the teeth of the molar teeth is more difficult than cleaning between the teeth of the front teeth, so when operating the grip portion so that the cleaning portion moves between the teeth of the molar teeth An overload tends to act on the shaft portion, which may cause the shaft portion to break or irritate the gums.

  The objective of this invention is providing the interdental cleaning tool which can suppress the bending of the axial part during the cleaning between teeth, and can reduce the irritation | stimulation to a gum.

  As a result of intensive studies to solve the above problems, the present inventors have determined that the longitudinal direction in the cross section of the grip portion (the cross section in the plane perpendicular to the axial direction of the shaft portion) is particularly during cleaning between the teeth of the molars. The cleaning part is often cleaned between teeth in a posture substantially parallel to the vertical, and the cleaning part is pressed relatively strongly against the side surface in order to effectively clean the side surface of the molar. It has been found that the gripping part tends to be operated. Therefore, the present inventors have proposed that the bending rigidity of the shaft portion when an external force in the direction in which the teeth are arranged acts on the shaft portion and the shaft when the external force in the direction orthogonal to the direction in which the teeth are arranged act on the shaft portion. By making the bending rigidity of the parts different from each other, the side surfaces of the molars are effectively cleaned in a posture in which the longitudinal direction in the cross section of the grip part (cross section in a plane orthogonal to the axial direction of the shaft part) is parallel to the vertical. It has been conceived that it is possible to achieve both reducing the stimulation to the gums.

  The present invention has been made from such a viewpoint. Specifically, the present invention has a shape that extends in a specific direction and can be inserted between teeth, and has an insertion end formed at one end in the specific direction and the other end in the specific direction. A shaft portion having a base end portion formed, and a grip portion extending from the base end portion so as to be separated from the shaft portion along the specific direction, and having a shape that can be gripped by a finger; And a cleaning part that covers at least a part of the shaft part and that can clean between teeth, and is based on the dimension of the grip part in the first direction that is perpendicular to the specific direction. The dimension of the grip portion in the second direction, which is a direction orthogonal to both the specific direction and the first direction, is larger than the dimension of the shaft portion in the direction parallel to the second direction. , About the direction parallel to the first direction It is larger dimension parts, providing interdental cleaner.

  In this interdental cleaning tool, the axis in the direction parallel to the first direction (direction perpendicular to the longitudinal direction of the gripping part) rather than the dimension of the shaft part in the direction parallel to the second direction (longitudinal direction of the gripping part) The dimension of the grip part is larger (since the longitudinal direction of the shaft part in the section perpendicular to the axial direction of the shaft part is perpendicular to the longitudinal direction of the grip part in the same section), the length of the grip part relative to the shaft part The bending stiffness of the shaft when an external force in a direction parallel to the direction perpendicular to the longitudinal direction of the gripping portion acts on the shaft, rather than the bending stiffness of the shaft when an external force in a direction parallel to the direction acts Is bigger. Therefore, when the interdental teeth of the molars (back teeth) are cleaned, that is, the cleaning part is located between the molars in a posture in which the longitudinal direction of the gripping part in the cross section orthogonal to the axial direction of the axial part is substantially vertical. When the grip portion is operated so as to move, the shaft portion is prevented from being bent due to the cleaning portion being strongly pressed against the side surfaces in order to clean the side surfaces of the adjacent molar teeth. Furthermore, since the bending rigidity of the shaft part in the direction orthogonal to the direction in which the molars are arranged is relatively small, stimulation of the gums due to the cleaning part contacting the gums during cleaning between the teeth of the molars is reduced. The

  In this case, the longitudinal direction of the shaft portion in the cross section with respect to the dimension of the shaft portion in the direction orthogonal to the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction. The ratio of the dimension of the shaft portion is preferably 101% or more and 140% or less.

  If it does in this way, bending of the shaft part during cleaning between teeth of molars will be controlled more certainly, and irritation to gums will be reduced more.

  Further, in this case, the gripping portion is disposed from the tip of the cleaning portion of the interdental cleaning tool in a posture in which the longitudinal direction of the shaft portion in a cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the vertical direction. The first force required to press a portion 7 mm away from the distal end of the cleaning portion toward the gripping portion of the interdental cleaning tool 5 mm vertically downward in a state where the portion 15 mm apart is fixed to the side. Among the interdental cleaning tools, the pressing force is 0.6 N or more and 2 N or less, and the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the horizontal direction. In a state where a part 15 mm away from the tip of the cleaning part toward the grip part is fixed, a part of the interdental cleaning tool 7 mm away from the tip of the cleaning part toward the grip part is pushed 5 mm vertically downward. It is preferred the second pressing force is the force required to is less than 1.95N than 0.5 N. When the first pressing force F1 is 100, the second pressing force F2 is preferably 102.6 to 400, more preferably 103.4 to 187.5, and still more preferably 103.4 to 125.

  If it does in this way, bending of the shaft part during cleaning between teeth of molars will be controlled more certainly, and irritation to gums will be reduced further.

  Further, in the interdental cleaning tool, the cleaning part includes a cleaning part body made of an elastomer having a hardness lower than the hardness of the base part and covers an outer peripheral surface of the shaft part, and the cleaning part body is the specified part A first covering portion that is a portion overlapping the shaft portion in a direction parallel to the longitudinal direction of the shaft portion in a cross section of the shaft portion on a plane orthogonal to the direction, and is orthogonal to the longitudinal direction of the shaft portion in the cross section A second covering portion that is a portion overlapping the shaft portion in a direction parallel to the direction, and the first covering portion with respect to the dimension of the shaft portion in a direction parallel to the longitudinal direction of the shaft portion in the cross section. The ratio of the thickness is 5% or more and 50% or less, and the ratio of the thickness of the second covering portion to the dimension of the shaft portion in the direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion in the cross section Is 1 % Or more and 60% or less, the thickness of the second covering portion is preferably larger than the thickness of the first covering portion.

  In this way, the thickness of the cleaning part body is sufficiently small with respect to the shaft part in both the longitudinal direction of the shaft part in the cross section and the direction perpendicular thereto, so that the cleaning part body has a bending rigidity of the shaft part. The influence on the anisotropy is almost eliminated, and the thickness of the second covering portion is larger than the thickness of the first covering portion, so that irritation to the gums is more reliably reduced.

  In this case, the cleaning part further includes a brush part having a shape protruding outward from the outer peripheral surface of the cleaning part main body in a direction orthogonal to the specific direction, and the brush part is orthogonal to the specific direction. It is preferable that a soft brush having a shape projecting outward from the second covering portion in a direction parallel to a direction orthogonal to the longitudinal direction of the shaft portion in a cross section of the shaft portion on a plane to be formed is included.

  In this way, the upper part between the lower molars and the lower part between the upper molars, which are particularly difficult to clean, are more effectively cleaned, and stimulation to the gums is also reduced. Specifically, since the soft brush is supported by the second covering portion having a thickness larger than the thickness of the first covering portion, the soft brush is compared with the case where the soft brush is provided on the outer peripheral surface of the first covering portion. The amount of displacement with respect to the shaft portion of the soft brush increases. Therefore, the upper part between the teeth of the lower molars and the lower part between the upper molars are more effectively cleaned, and the stimulation to the gums is also reduced.

  As described above, according to the present invention, it is possible to provide an interdental cleaning tool that can suppress breakage of the shaft portion during cleaning between teeth and can reduce irritation to the gums.

It is a front view of the interdental cleaning tool group of one Embodiment of this invention. It is sectional drawing in the II-II line | wire of FIG. It is a figure which shows the outline of the measuring method of a 1st pressing force. It is a figure which shows the outline of the measuring method of 2nd pressing force. It is a figure which shows the outline of a mode that an interdental cleaning tool is inserted between the teeth of molars (back teeth).

  An interdental cleaning tool 2 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an interdental cleaning tool group 1 including a plurality (ten in this embodiment) of interdental cleaning tools 2 connected to each other. The interdental cleaning tools 2 adjacent to each other are connected to each other by a connection portion 32. Each interdental cleaning tool 2 has a base portion 10 made of a synthetic resin and a cleaning portion 40 made of an elastomer having a hardness lower than the hardness of the synthetic resin.

  The base portion 10 includes a shaft portion 20 and a grip portion 30. The base 10 is made of a synthetic resin such as polypropylene, polyethylene, ABS, polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polystyrene, polyacetal. In this embodiment, the base 10 is formed of a synthetic resin containing 30% by weight of glass fiber.

  The shaft portion 20 has a shape that extends linearly along a specific direction (left-right direction in FIG. 1) and can be inserted between teeth. An insertion end portion is formed at one end of the shaft portion 20 (left end in FIG. 1), and a proximal end portion is formed at the other end of the shaft portion 20. The shaft portion 20 has a shape in which the outer shape gradually decreases from the base end portion toward the insertion end portion. FIG. 2 shows a cross section of the shaft portion 20 and the cleaning portion 40 in a plane orthogonal to the axial direction of the shaft portion 20 (hereinafter referred to as “axis orthogonal cross section”). As shown in FIG. 2, the shaft portion 20 has a dimension L1 in the first direction (left-right direction in FIG. 2) which is a direction orthogonal to the axial direction of the shaft portion 20 in the cross-axis orthogonal section. And a dimension larger than a dimension L2 in a second direction (vertical direction in FIG. 2) orthogonal to both the direction and the first direction. The ratio of the dimension L1 to the dimension L2 is preferably set to 101% or more and 140% or less, and more preferably set to 103% or more and 125% or less. In this embodiment, this ratio is set to 108%.

  The grip portion 30 extends along the axial direction of the shaft portion 20 so as to be separated from the base end portion of the shaft portion 20, and has a shape that can be gripped by a finger. The grip part 30 is formed flat. Specifically, as shown in FIG. 2, the gripping portion 30 is configured so that the longitudinal direction of the gripping portion 30 in the axis orthogonal cross section is orthogonal to the first direction (the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section). Connected to the base end.

  The cleaning part 40 is a part for cleaning between teeth, and is formed of an elastomer having a hardness lower than the hardness of the base part 10. In this embodiment, a styrene elastomer is used as the elastomer. However, silicon, an olefin elastomer, a polyester elastomer, or the like may be used as the elastomer. In the present embodiment, the cleaning unit 40 includes a cleaning unit main body 42 and a plurality of brush units 44. Further, as the hardness of the elastomer, durometer hardness type A (JISK6253) is preferably 10-50, and in the present embodiment, the durometer hardness type A is 35.

  The cleaning part main body 42 has a shape that covers at least a part of the outer peripheral surface of the shaft part 20 (part including the insertion end). The length of the cleaning part main body 42 in the axial direction of the shaft part 20 is set to 15.5 mm. As shown in FIG. 2, the outer shape of the cleaning unit main body 42 in the cross section orthogonal to the axis is circular. The cleaning portion main body 42 includes a first covering portion 42a that is a portion overlapping the shaft portion 20 in a direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section, and a direction orthogonal to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section. 2nd covering part 42b which is a part which overlaps with axis part 20 about the direction parallel to the direction. The thickness t2 of the second covering portion 42b is larger than the thickness t1 of the first covering portion 42a.

  Further, the ratio of the thickness t1 of the first covering portion 42a to the dimension L1 of the shaft portion 20 in the direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section may be set to 5% or more and 50% or less. Preferably, it is more preferably set to 10% or more and 40% or less. In the present embodiment, this ratio is set to 23%. And the ratio of thickness t2 of the 2nd coating | coated part 42b with respect to the dimension L2 of the axial part 20 about the direction parallel to the direction orthogonal to the longitudinal direction of the axial part 20 in an axial orthogonal cross section is set to 10% or more and 60% or less. It is preferable to be set to 15% or more and 45% or less. In this embodiment, this ratio is set to 28%.

  Each brush portion 44 has a shape protruding outward from the outer peripheral surface of the cleaning portion main body 42 in a direction orthogonal to the axial direction of the shaft portion 20. In the present embodiment, each brush portion 44 is formed in a conical shape. As shown in FIG. 2, the plurality of brush portions 44 are soft brushes having a shape that protrudes outward from the second covering portion 42b in a direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion 20 in the axial orthogonal cross section. 44a.

  In the present embodiment, the shaft portion 20 has a shape in which the dimension L1 in the first direction is larger than the dimension L2 in the second direction in the axis orthogonal cross section. Than the cross-section secondary moment of the shaft portion 20 around the axis (weak axis) parallel to the longitudinal direction of the shaft portion 20 and the longitudinal direction of the shaft portion 20 through the center of the shaft portion 20 in the axis orthogonal cross section. The cross-sectional secondary moment of the shaft portion 20 around the axis (strong axis) parallel to the orthogonal direction is larger. That is, the first pressing force F1, which is a force required to press the shaft portion 20 in a direction parallel to the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section, is the longitudinal direction of the shaft portion 20 in the axis orthogonal cross section. It is larger than the second pressing force F2 that is a force necessary to press the shaft portion 20 in a direction parallel to the orthogonal direction.

  FIG. 3 shows a method for measuring the first pressing force F1, and FIG. 4 shows a method for measuring the second pressing force F2. The first pressing force F1 is a portion of the interdental cleaning tool 2 that is 15 mm away from the tip of the cleaning unit 40 toward the gripping unit 30 in a posture in which the longitudinal direction of the shaft unit 20 in the axis orthogonal cross section is parallel to the vertical. In the state fixed by the fixing jig 51, it is necessary to press a portion 7 mm away from the tip of the cleaning unit 40 toward the gripping unit 30 in the interdental cleaning tool 2 by a pressing force measuring device 52 vertically downward by 5 mm. It is power. The second pressing force F2 fixes a portion of the interdental cleaning tool 2 that is 15 mm away from the tip of the cleaning unit 40 toward the gripping unit 30 in a posture in which the longitudinal direction of the shaft unit 20 in the cross section perpendicular to the axis is perpendicular to the vertical direction. In the state fixed by the jig 51, the force required to press a portion of the interdental cleaning tool 2 that is spaced 7 mm from the tip of the cleaning unit 40 toward the gripping unit 30 by the pressing force measuring device 52 vertically downward by 5 mm. It is.

  Specifically, the first pressing force F1 is measured as follows. That is, the pressing force measuring device 52 is vertically lowered 5 mm at 20 mm / min from the state in which the pressing force measuring device 52 is in contact with a portion of the interdental cleaning tool 2 that is spaced 7 mm from the tip of the cleaning portion 40 toward the gripping portion 30. Displace. When the shaft portion 20 is bent due to the pressing by the pressing force measuring device 52, the portion is displaced 5 mm vertically downward. The pressing force at this time, that is, the first pressing force F <b> 1 is measured by the pressing force measuring device 52. The same applies to the second pressing force F2. In the present embodiment, the first pressing force F1 is 1.36N. The second pressing force F2 is 1.22N. As the pressing force measuring device 52, AUTOGRAPH AGS-J 1kN (manufactured by Shimadzu Corporation) and an attached attachment for force gauge (manufactured by Imada Co., Ltd./A type S-4) were used.

  The first pressing force F1 is preferably 0.6N or more and 2N or less, and more preferably 1N or more and 1.5N or less. The second pressing force F2 is preferably not less than 0.5N and not more than 1.95N, and more preferably not less than 0.8N and not more than 1.45N. In other words, the cross-sectional shape of the shaft portion 20 is set so that the first pressing force F1 is 0.6N or more and 2N or less and the second pressing force F2 is 0.5N or more and 1.95N or less.

  Next, with reference to FIG. 5, a description will be given of a case where the interdental cleaning tool 2 described above cleans the interdental teeth between the molars (back teeth) T in particular. When the interdental space between the molar teeth T is cleaned by the interdental cleaning tool 2 including the grip portion 30 formed flat and the shaft portion 20 having a linearly extending shape as in the present embodiment, the interdental space As shown in FIG. 5, the user of the cleaning tool 2 holds the cleaning unit 40 between the molar teeth T in a state in which the gripping unit 30 is gripped in a posture in which the longitudinal direction of the gripping unit 30 in the axis orthogonal cross section is substantially vertical. It is often inserted into the oral cavity facing in between. And a user operates the holding | grip part 30 so that the cleaning part 40 moves along between teeth. At this time, since the cleaning unit 40 is pressed against the side surface of the molar tooth T, the side surface and the space between the teeth are effectively cleaned.

  In the interdental cleaning tool 2 of the present embodiment, a direction orthogonal to the longitudinal direction of the gripping portion 30 in the axial orthogonal cross section is larger than the dimension L2 of the shaft portion 20 in a direction parallel to the longitudinal direction of the gripping portion 30 in the axial orthogonal cross section. Since the dimension L1 of the shaft portion 20 with respect to the parallel direction is larger (because the longitudinal direction of the shaft portion 20 in the axial orthogonal cross section is orthogonal to the longitudinal direction of the grip portion 30 in the axial orthogonal cross section), On the other hand, rather than the bending rigidity of the shaft portion 20 when an external force in a direction parallel to the longitudinal direction of the grip portion 30 in the axis orthogonal cross section is applied, the shaft portion 20 is orthogonal to the longitudinal direction of the grip portion 30 in the axis orthogonal cross section. The bending rigidity of the shaft portion 20 when an external force in a direction parallel to the direction to be applied is greater. Therefore, when the interdental teeth of the molar teeth T are cleaned, that is, the cleaning unit 40 moves along the interproximal teeth of the molar teeth T in a posture in which the longitudinal direction of the gripping portion 30 in the axial orthogonal section is substantially vertical. When the grip portion 30 is operated, the shaft portion 20 is prevented from being bent due to the cleaning portion 40 being strongly pressed against the side surfaces of the adjacent molar teeth T to be cleaned. Furthermore, since the bending rigidity of the shaft portion 20 in the direction orthogonal to the direction in which the molar teeth T are arranged is relatively small, the gum G caused by the cleaning portion 40 coming into contact with the gum G during the cleaning between the teeth of the molar teeth T. Irritation is reduced.

  Further, since the ratio of the dimension L1 in the longitudinal direction of the shaft part 20 in the axis orthogonal cross section to the dimension L2 in the direction orthogonal to the longitudinal direction of the shaft part 20 in the axis orthogonal cross section is 101% or more and 140% or less. The bending of the shaft portion 20 during the cleaning between the teeth is more reliably suppressed, and the stimulation to the gum G is further reduced.

  Further, since the first pressing force F1 is 0.6N or more and 2N or less and the second pressing force F2 is 0.5N or more and 1.95N or less, the shaft during cleaning between the teeth of the molar teeth T is performed. The bending of the part 20 is further reliably suppressed, and the stimulation to the gum G is further reduced.

  In the present embodiment, the ratio of the thickness t1 of the first covering portion 42a to the dimension L1 of the shaft portion 20 is not less than 5% and not more than 50%, and the second covering portion 42b to the dimension L2 of the shaft portion 20 is. The ratio of the thickness t2 is 10% or more and 60% or less. For this reason, since the thickness of the cleaning part main body 42 is sufficiently small with respect to the shaft part 20 in both the longitudinal direction of the shaft part 20 and the direction orthogonal thereto in the axial orthogonal section, the cleaning part main body 42 becomes the shaft part 20. The influence of the bending stiffness on the anisotropy of the bending stiffness is almost eliminated. Furthermore, since the thickness t2 of the second covering part 42b is larger than the thickness t1 of the first covering part 42a, the stimulation to the gum G is more reliably reduced.

  Further, since the brush portion 44 includes a soft brush 44a having a shape protruding outward from the second covering portion 42b, the upper portion between the lower molars and the intermaxillary molars that are particularly difficult to clean. The lower part is more effectively cleaned and the irritation to the gums is also reduced. Specifically, since the soft brush 44a is supported by the second covering portion 42b having a thickness t2 larger than the thickness t1 of the first covering portion 42a, the soft brush 44a is an outer peripheral surface of the first covering portion 42a. The amount of displacement of the soft brush 44a relative to the shaft portion 20 is larger than that provided in the case. Therefore, the upper part between the teeth of the lower molars and the lower part between the upper molars are more effectively cleaned, and the stimulation to the gum G is also reduced.

  In addition, it should be thought that the said embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, the cross-sectional shape of the shaft portion 20 is not limited to the example of the above embodiment. The cross-sectional shape of the shaft portion 20 can be set to an arbitrary shape (such as an ellipse or a polygon) having a strong axis and a weak axis.

DESCRIPTION OF SYMBOLS 1 Interdental cleaning tool group 2 Interdental cleaning tool 10 Base part 20 Shaft part 30 Gripping part 40 Cleaning part 42 Cleaning part main body 42a 1st coating | coated part 42b 2nd coating | coated part 44 Brush part 44a Soft brush

Claims (5)

It has a shape that extends in a specific direction and can be inserted between teeth, and has an insertion end formed at one end in the specific direction and a base end formed at the other end in the specific direction. A base portion having a shaft portion, and a grip portion extending from the base end portion so as to be separated from the shaft portion along the specific direction and having a shape that can be gripped by a finger;
A cleaning part that covers at least a part of the shaft part and is capable of cleaning between teeth;
The dimension of the grip part in the second direction, which is the direction orthogonal to both the specific direction and the first direction, than the dimension of the grip part in the first direction, which is a direction orthogonal to the specific direction. Is big,
An interdental cleaning tool, wherein the dimension of the shaft part in the direction parallel to the first direction is larger than the dimension of the shaft part in a direction parallel to the second direction. The interdental cleaning tool according to claim 1,
The dimension of the shaft portion in the longitudinal direction of the shaft portion in the section relative to the dimension of the shaft portion in the direction orthogonal to the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction. An interdental cleaning tool in which the proportion of dimensions is 101% or more and 140% or less. In the interdental cleaning tool of Claim 2,
In a posture in which the longitudinal direction of the shaft portion in the cross section of the shaft portion in a plane orthogonal to the specific direction is parallel to the vertical, the interdental cleaning tool is spaced 15 mm from the tip of the cleaning portion toward the grip portion side. In a state where the part is fixed, the first pressing force, which is a force required to press the part spaced 7 mm from the tip of the cleaning part to the grip part side by 5 mm vertically downward, is 0. 6N or more and 2N or less, and the tip of the cleaning part of the interdental cleaning tool in a posture in which the longitudinal direction of the shaft part in the cross section of the shaft part in a plane orthogonal to the specific direction is parallel to the horizontal. Force required to press a portion 7 mm away from the tip of the cleaning unit 7 mm toward the gripping portion 5 mm vertically downward in a state where a portion 15 mm away from the gripping portion is fixed Is Second pressing force is less than 1.95N than 0.5 N, interdental cleaner. In the interdental cleaning tool in any one of Claims 1 thru | or 3,
The cleaning part includes a cleaning part body made of an elastomer having a hardness lower than the hardness of the base part and covering the outer peripheral surface of the shaft part,
The cleaning unit body is
A first covering portion that is a portion overlapping the shaft portion in a direction parallel to a longitudinal direction of the shaft portion in a cross section of the shaft portion in a plane orthogonal to the specific direction;
A second covering portion that is a portion overlapping the shaft portion in a direction parallel to a direction orthogonal to the longitudinal direction of the shaft portion in the cross section,
The ratio of the thickness of the first covering portion to the dimension of the shaft portion in a direction parallel to the longitudinal direction of the shaft portion in the cross section is 5% or more and 50% or less,
The ratio of the thickness of the second covering portion to the dimension of the shaft portion in a direction parallel to the direction orthogonal to the longitudinal direction of the shaft portion in the cross section is 10% or more and 60% or less,
The interdental cleaning tool, wherein the thickness of the second covering portion is larger than the thickness of the first covering portion. The interdental cleaning tool according to claim 4,
The cleaning part further includes a brush part having a shape protruding outward from an outer peripheral surface of the cleaning part main body in a direction orthogonal to the specific direction,
The brush portion has a shape that protrudes outward from the second covering portion in a direction parallel to a direction orthogonal to a longitudinal direction of the shaft portion in a cross section of the shaft portion in a plane orthogonal to the specific direction. Interdental cleaning tool including brush.

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