JP4361473B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush for cleaning the oral cavity.

  To prevent oral diseases such as dental caries and periodontal disease, it is important to remove dirt such as dental plaque and food residues that adhere to and accumulate on the tooth surface, gingival crevice, interdental area, or mucous membrane. . There is a toothbrush as an oral cleaning tool for performing these removal operations.

  Usually, handling of the toothbrush does not require a particularly high level of skill for the general person, and the cleaning operation in the oral cavity can be easily performed by brushing. However, for people with physical disabilities, especially those who are bedridden, it may be extremely difficult to contain water in the oral cavity or to discharge saliva or bubbles collected in the oral cavity. . The discharge of saliva, foam, etc. is important for the safe and continuous cleaning of the oral cavity.

  2. Description of the Related Art Conventionally, as a toothbrush for the purpose of cleaning the oral cavity of people who have inconvenient parts, especially those who are bedridden, those equipped with a discharge mechanism that sucks moisture etc. accumulated in the oral cavity have been proposed ( For example, Patent Documents 1 to 3).

  Patent Document 1 includes a handle portion provided with a head portion at the tip, and the head portion is provided with a water supply port for injecting water and a suction port for sucking moisture and the like. A suction hole provided in the handle portion in communication and a gripping portion provided with a water tank and a water pump so as to be attachable to and detachable from the handle portion, and the suction port of the head portion; The toothbrush provided in the front-end | tip of the handle | pattern part in both sides is described.

  In Patent Document 2, the head portion at the tip of the gripping portion has a flocking surface, and the head portion is formed with a pre-purified water supply port that opens to the flocked surface and a drain port that discharges the supplied pre-purified water, A toothbrush is described in which a pre-purified water supply port is connected to a cleaning water supply source, a drainage port is connected to a suction negative pressure source, and a flexible skirt material surrounding the flocked surface is provided.

In Patent Document 3, a plurality of brushes or a plurality of brush bodies are implanted on the head portion flocking surface, a circular or elliptical water absorption hole is provided on the head portion flocking surface, and a brush or a brush body around the water absorption hole. However, a toothbrush planted so as to be arranged in a circular or elliptical shape similar to the opening shape of the water absorption hole with the water absorption hole as a center is described.
Japanese Patent No. 3190606 JP-A-10-113231 JP 2004-135935 A

  In the toothbrush described in Patent Document 1, since the suction ports are provided on both sides (two places) of the brush of the head portion, the dimension in the width direction of the head portion is widened. For this reason, both side portions of the head portion formed wider than the brush body may become an obstacle when the inside of the oral cavity is brushed with a toothbrush, and the gingiva may be damaged by the both side portions of the head portion. Further, since the direction of the suction port is the same as the direction in which the brush body is formed, the brush body becomes an obstacle and the suction efficiency may be reduced.

  The toothbrush described in Patent Document 2 has a suction port and a water absorption port provided in the flocked surface of the head part, and removes dirt by sucking water and residues after washing while brushing the oral cavity. It is. In this configuration, bubbles are entangled at the root of the flocked surface, and the surrounding air is mainly sucked through the bubbles, making it difficult to suck high-viscosity water containing saliva, and sucking and removing saliva and dirt. There is a possibility that the effect is reduced.

  In the toothbrush described in Patent Document 3, the periphery of the opening of the water absorption port is surrounded by a brush or a brush body protruding from the head portion flocking surface. For this reason, there is a possibility that the brush or the brush body becomes an obstacle and the water absorption port and the oral cavity are separated from each other, so that moisture, residues and the like cannot be sucked.

  In the case of a toothbrush provided with a conventional discharging mechanism, there is a problem that the suction effect is reduced particularly when the toothbrushing continues to blossom in the oral cavity. In order to improve the suction effect, there is a method to increase the suction force by strengthening the suction pump, but if only the suction force is increased, the oral cavity such as cheeks may be sucked and the oral mucosa may be adsorbed to the suction port For example, satisfactory suction effect was not obtained, and improvement was desired.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a toothbrush that has excellent suction power and can perform safe and comfortable oral cleaning continuously.

As a result of the study, the present applicant has determined that when a suction port is provided on the flocked surface of a conventional toothbrush, air bubbles are entangled at the root of the flocked surface, and high viscosity water including saliva is not sucked through the air bubbles. As a result, it was found that ambient air was mainly sucked and the suction effect of liquid such as moisture deteriorated.
Therefore, the applicant solves the above problem by providing the suction port at a position other than the flocked surface of the head part, specifically, the side surface, back surface, or front end surface of the head unit, preferably the front end surface of the head. The present invention has been completed by finding out what can be done.

The present invention provides the following toothbrushes.
In the first invention, the toothbrush has a head part in which a brush body is implanted, a neck part, and a grip part, and is located at any position other than the flocked surface from the neck part to the tip of the head part. At least one suction port is formed, a discharge passage is formed so as to penetrate the toothbrush in communication with the suction port, and the suction port is directed toward the back side opposite to the flocked surface, A water supply that is provided so as to expand more than the discharge passage, has a discharge port formed at the other end of the discharge passage, and further discharges water to any position from the neck to the tip of the head portion At least one or more ports are provided, and includes a water supply passage provided so as to penetrate the toothbrush in communication with the water supply port, and a water intake port provided at the other end of the water supply passage and into which water is introduced. To provide a toothbrush characterized by
According to a second aspect of the present invention, there is provided a toothbrush characterized in that a vent hole communicating with the discharge passage is provided at any position of the neck portion or the grip portion.
In 3rd invention, the said neck part and the said holding part are assembled | attached so that attachment or detachment is possible, The toothbrush characterized by the above-mentioned is provided .

The toothbrush of the present invention is provided with at least one suction port at any position from the neck to the head end, a discharge passage provided in communication with the suction port, and a discharge port provided at the other end of the discharge passage. And an exit.
As a result, similar to the initial stage of tooth brushing where moisture with low viscosity is accumulated in the mouth, even if the mouth is foamed by continuing brushing, moisture and residues containing saliva etc. Can be smoothly and efficiently sucked and discharged, so that the person to be cleaned can continuously brush his / her teeth without expelling moisture in the oral cavity.
Therefore, safe and comfortable intraoral cleaning can be performed continuously, and it is particularly suitable for brushing people who have inconvenient parts or those who are bedridden.
Further, in the toothbrush of the present invention, by providing the suction port at a position other than the flocked surface of the head portion, it is possible to suck and discharge moisture and residues more efficiently without being affected by the brush body. it can.

Hereinafter, embodiments of a toothbrush according to the present invention will be described with reference to the drawings.
1 and 2 (a) and 2 (b) show a first embodiment of the toothbrush of the present invention. This toothbrush 1 has a head portion 2 in which a brush body 27 is implanted on a flocked surface 23. FIG. And at least one suction port 51 is formed at any position other than the flocked surface 23 from the neck 3 to the tip surface 22 of the head portion 2, A discharge passage 5 is formed so as to communicate with the mouth 51 and pass through the inside of the toothbrush, and a discharge port 52 is formed at the other end of the discharge passage 5 and is schematically configured.

  As shown in the figure, the toothbrush is composed of a neck portion 3 extending narrower than the grip portion 4 from the grip portion 4 gripped by the user, and extending thicker than the neck portion 3 from the neck portion 3 to scrub the teeth. However, the shape of the toothbrush is not limited to this, and for example, the grip portion and the neck portion are configured to have the same dimensions. It may be a thing.

The head unit 2 includes a head main body 21 provided with a flocked surface 23 and a brush body 27 formed by bundling brushes and fixed to the flocked surface 23.
The head body 21 has a tip surface 22 that is the tip of the toothbrush 1, side surfaces 24 and 25, a flocked surface 23, and a back surface 26 opposite to the flocked surface 23.
The brush body 27 is formed by bundling elongated brushes, and is fixed to a plurality of locations on the flocked surface 23. The brush body 27 is used for scrubbing teeth when brushing with the toothbrush 1.
In the toothbrush 1 of the present embodiment, the suction port 51 is provided in the distal end surface 22, and the discharge passage 5 is provided so as to penetrate the head part 2, the neck part 3 and the grip part 4 in the toothbrush length direction. Yes.

  The resin constituting the head body 21 is not particularly limited, and examples thereof include polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polymethyl methacrylate, cellulose propionate, polyurethane, polyamide, ABS, and the like in terms of cost. Is preferably used.

The brush body 27 may be a known toothbrush brush, and examples thereof include polyamide (nylon 6-10, nylon 6-12, etc.) and polyester (polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, etc.). .
Although the thickness of a brush is not specifically limited, Usually, the thing of 4 mil (0.102 mm)-8 mil (0.203 mm) is used, and it is preferable that the hair end is rounded and processed by grinding | polishing. Further, the hair cutting shape is not particularly limited, but in addition to general flat cutting, mountain cutting or ship bottom cutting or the like is used. The length of the brush from the flocked surface 23 is preferably 5 to 10 mm from the viewpoint of the operability in the oral cavity and the brushing effect.
As a method for fixing the brush body 27 to the flocked surface 23, a known method may be used. For example, in addition to a flat wire flocking method using a metal piece (flat wire), the lower end of the brush body is heated and melted to melt the lump. In-mold method for manufacturing a toothbrush by injecting molten resin into a mold (Japanese Patent No. 2601452, Japanese Patent Publication No. 9-512724), and a toothbrush that melts a brush body melting portion And a heat fusion method (Japanese Patent Publication No. 6-46962) for fixing by press-fitting into the head portion.

The size of the flocked surface 23 for fixing the brush body 27 to the head body 21 is 10 to 20 mm in the toothbrush length direction and 6 to 10 mm in the width direction from the viewpoint of operability in the oral cavity and tooth brushing efficiency. preferable.
The dimension in the thickness direction of the head body 21 (vertical direction in FIG. 2 (b)) is preferably 6 to 10 mm, more preferably 7 to 9 mm in consideration of providing the suction port 51 and the drainage passage 5.
The shape of the head part 2 is preferably formed in an oval shape as seen from the side of the flocked surface 23 as shown in the drawing from the viewpoint of operability in the oral cavity and brushing efficiency. Further, as shown in the illustrated example, the tip surface 22 is formed in a curved surface so that the dimension in the thickness direction of the head body 21 (the vertical direction in FIG. 2B) gradually decreases toward the toothbrush tip. However, it is preferable from the viewpoints of operability in the oral cavity and tooth brushing efficiency.
In the case of a toothbrush in which the thickness dimension of the head portion 2 is increased by providing the discharge passage 5 like the toothbrush 1 of the present embodiment, the tip surface 22 is formed in a curved shape, so that the toothbrush in the oral cavity is formed. Operability is improved.

The neck portion 3 extends from the grip portion 4 and functions as a support for the head portion 2. A discharge passage 5 is provided inside the neck portion 3 so as to penetrate the neck portion 3 in the length direction.
As a material constituting the head portion 4, a known material may be adopted as in the case of the head portion 2 and can be determined as appropriate.

The grip portion 4 is formed in the shape of an elongated bar, and has a discharge passage 5 provided through the inside, and a discharge port 52 provided in the rear end surface 4a in communication with the discharge passage.
The gripper 4 is preferably configured in a shape that can be easily gripped by hand when cleaning the oral cavity using the toothbrush 1, and may be appropriately determined.
As the material constituting the grip portion 4, a known material may be adopted as in the case of the head portion 2 and the neck portion 3 and can be determined as appropriate.

At least one suction port 51 is provided at any position other than the flocked surface 23 of the head unit 2, and is provided at the center of the tip surface 22 of the head unit 2 in the present embodiment. The suction port 51 is an inlet for sucking moisture, residues, and the like in the oral cavity, and the sucked moisture and the like are guided to the discharge port 52 through the discharge passage 5 communicating with the suction port 51.
The suction port 51 is preferably provided at the center of the distal end surface 22 as in the illustrated example, but the position where the suction port 51 is provided may be appropriately determined.
The shape of the suction port 51 is not particularly limited and may be arbitrary. From the viewpoint of the suction efficiency of moisture and the like, a circular or elliptical shape is preferable from the viewpoint of suction efficiency.
The size of the suction port 51 is preferably in the range of 1 to 3 mm in diameter or major axis from the viewpoint of suction efficiency of moisture or the like, and more preferably 1.5 to 2.5 mm.
The suction port 51 is preferably configured to expand to a longer diameter than the discharge passage 5 communicating with the suction port 51 so that the suction port 51 is not blocked by the oral mucosa. When the suction port 51 is provided on the distal end surface 22, it is more preferable that the suction port 51 is configured to expand toward the back surface 26 side (upward in FIG. 2B). By configuring the suction port 51 to expand toward the back surface 26 side, the entire suction port 51 is positioned closer to the neck 3 side than the top 22a. Thereby, even if the top part 22a is in contact with the oral mucosa or the like, the suction port 51 is not blocked by the oral mucosa.
When the suction port 51 is configured to expand toward the flocked surface 23 side (downward in FIG. 2 (b)), that is, toward the top portion 22a, the suction port 51 is likely to suck the oral mucosa and may be blocked. is there.
In the illustrated example, since the suction port 51 is provided in the central portion of the distal end surface 22, the entire suction port 51 is located on the neck 3 side with respect to the top portion 22a, and the top portion 22a is in contact with the oral mucosa and the like. Even in this case, the suction port 51 is not blocked by the oral mucosa.

The discharge passage 5 is a hollow passage communicating between the suction port 51 and the discharge port 52, and is provided so as to penetrate the inside of the toothbrush 1 in the present embodiment.
In terms of the efficiency of discharging moisture and the like, it is preferable for the discharge passage 5 to determine the positions of the suction port 51 and the discharge port 52 so that the path of the discharge passage 5 is substantially linear. Specifically, as shown in the illustrated example, the discharge passage 5 is formed substantially linearly by providing the suction port 51 on the front end surface 22 of the head portion 2 and the discharge port 52 on the rear end surface 4a of the grip portion 4. However, the positions of the suction port 51 and the discharge port 52 and the path shape of the discharge passage 5 may be determined as appropriate.
In addition, a plurality of suction ports 51 may be provided at arbitrary positions in the path of the discharge passage 5.

The discharge port 52 is provided on the rear end surface 4 a of the grip portion 4 and functions as an outlet of the discharge passage 5. A suction pipe 6 whose other end is connected to the suction pump 7 is connected to the discharge port 52. In the illustrated example, an adapter 61 provided at the tip of the suction pipe 6 is detachably attached to the discharge port 52. However, the connection method between the discharge port 52 and the suction pipe 6 may be another method, for example, a fixed type by bonding or the like.
The discharge port 52 can be provided at an arbitrary position of the toothbrush 1, but is preferably provided on the rear end surface 4 a of the grip portion 4 from the surface of the toothpaste operability.

Hereinafter, the form which performs washing | cleaning in an oral cavity using the toothbrush 1 of this embodiment is demonstrated.
As shown in FIG. 7, one end of the suction pipe 6 is connected to the discharge port 52, and the suction pump 7 is connected to the other end of the suction pipe 6.
When using the toothbrush 1, the brush body 27 shown in FIG. 1 is used to brush the portion to be cleaned in the oral cavity, the suction pump 7 is operated, and the suction port 51 provided on the front end surface 22 of the head portion 2. As soon as possible, water and residue in the mouth are sucked from the mouth. Moisture, residue, and the like sucked from the suction port 51 are guided to a suction tank (not shown) provided in the suction pump 7 through the suction pipe 6.

As a result, similar to the initial stage of tooth brushing where moisture with low viscosity is accumulated in the mouth, even if the mouth is foamed by continuing brushing, moisture and residues containing saliva etc. Can be smoothly and efficiently sucked and discharged, so that the person to be cleaned can continuously brush his / her teeth without expelling moisture in the oral cavity.
Therefore, safe and comfortable intraoral cleaning can be performed continuously, and it is particularly suitable for brushing people who have inconvenient parts or those who are bedridden.
Further, in the toothbrush 1 of the present embodiment, by providing the suction port 51 on the distal end surface 22 of the head portion 2, it is possible to suck water, residue, and the like more efficiently without being affected by the brush body 27. Can do.

The example in which the suction port 51 is provided on the distal end surface 22 of the head portion 2 of the toothbrush has been described above, but the position where the suction port 51 is provided is not limited to this.
In the toothbrush 11 shown in FIGS. 3A and 3B, a suction port 53 is provided on one side surface 24 of the head portion 2. The position where the suction port 53 is provided may be the other side surface 25 or both side surfaces.
In the toothbrush 12 shown in FIG. 4, a suction port 54 is provided on the back surface 26 of the head portion 2.
Since the suction port 53 is provided not on the tip of the head portion 2 but on the side surfaces 24, 25 and the back surface 26, even if the tip contacts the mucous membrane of the mouth during the brushing operation, the oral mucosa is sucked. There is no fear.
About the position and number which provide a suction port, it can determine suitably and can combine.

Hereinafter, a second embodiment of a toothbrush according to the present invention will be described with reference to the drawings.
FIG. 5 is a diagram showing the toothbrush 13 of the present embodiment. In the following description, the same reference numerals are given to the common parts with the toothbrush 1 of the first embodiment, and the description thereof is omitted.
The toothbrush 13 is different from the toothbrush 13 of the first embodiment in that the neck portion 31 and the grip portion 41 are detachably attached.

As shown in FIG. 5, the toothbrush 13 is configured to be fixed by pressure-inserting the attachment protrusion 31 a of the neck portion 31 into the attachment groove 41 a of the grip portion 41. The discharge passage 5a provided through the head portion 2 and the neck portion 3 and the discharge passage 5b provided through the grip portion 41 communicate with each other and are provided at the rear end portion of the grip portion 41. The suction pipe 6 is connected to the discharged outlet 52.
In the toothbrush 13, like the toothbrush 1 of the first embodiment, moisture, residue, and the like sucked from the suction port 51 are guided to the suction pipe 6 through the discharge passages 5a and 5b and the discharge port 52.
In the present embodiment, the neck portion 31 and the grip portion 41 are configured to be detachable. However, for example, the neck portion 31 and the head portion 2 may be configured to be detachable. Can be appropriately determined.

Hereinafter, a third embodiment of the toothbrush according to the present invention will be described with reference to the drawings.
FIGS. 6A and 6B are views showing the toothbrush 14 of the present embodiment. The second point is that an air vent is provided at any position of the neck portion 31 or the grip portion 41. Different from the toothbrush 13 of the embodiment.

In the toothbrush 14, when suction is performed using the suction pump 7 and the suction tube 6 described above, suction from the suction port 51 can be performed by closing the vent hole 8 with a finger or the like. When the vent 8 is opened, the suction force from the suction port 51 can be weakened by the air flowing into the discharge passages 5a and (5b) from the vent 8.
Thereby, when brushing in the oral cavity, the suction port 51 can be weakened by opening the vent hole 8 and the oral cavity is sucked during brushing, and the suction mucous membrane 51 is blocked by the oral mucosa. There is no. In addition, by closing the vent hole 8 with a finger or the like after the brushing is completed, moisture, residue, or the like accumulated in the oral cavity can be sucked from the suction port 51.
The vent 8 may be provided at an arbitrary position of the neck portion 31 or the grip portion 41, but may be provided at the rear end side (the grip portion 41 side) of the neck portion 31 or the front end side (the neck portion 31 side) of the grip portion 41. From the viewpoint of operability for closing and opening the vent hole 8 with a finger.
Further, in the present embodiment, an example in which the vent hole 8 is provided in a toothbrush in which the neck portion and the gripping portion are detachable has been described. However, as in the toothbrush 1 of the first embodiment shown in FIG. Needless to say, the vent 8 may be provided at an arbitrary position of the body-type toothbrush.

In the toothbrush according to the present invention, the head portion is provided with a pre-purified water supply port, and is connected to the water supply port so as to penetrate the inside of the toothbrush, and is connected to the water supply passage from the outside of the toothbrush. It is good also as a structure provided with the water intake which inject | pours purified water.
By providing pre-purified water in the oral cavity by providing a water supply port, the cleaning effect in the oral cavity is enhanced, and after washing, moisture, residues, etc. can be immediately inhaled from the suction port. There is no discomfort.
When providing a water supply port in a toothbrush, providing in the position near the front end surface of the flocking surface of a head part is preferable at the point of the supply efficiency of the water to an intraoral area, or a washing | cleaning efficiency.

Below, the Example and comparative example of a toothbrush which concern on this invention are described.
A toothbrush according to the present invention provided with a suction port as shown in FIGS. 2, 3, and 4 and a toothbrush provided with a conventional suction port as shown in FIG. 8 were prepared and immediately after the start of brushing (starting 30 seconds) After) and the amount of water sucked in the oral cavity 3 minutes after the start of brushing was measured.
As a measurement method, toothbrushing is performed using each toothbrush, and after 30 seconds and 3 minutes from the start of brushing, the weight of water sucked from the oral cavity and collected in the tank of the suction pump is measured, and suction per unit time is measured. The amount was determined.

Based on the measurement results using each toothbrush, a pass / fail judgment was made according to the following evaluation criteria (indicated by ◯ ×).
(1) ○: Aspiration amount of water accumulated in the oral cavity is 5 ml / min or more.
(2) Δ: Aspiration amount of water accumulated in the oral cavity is 1 ml / min or more and less than 5 ml / min.
(3) x: The amount of moisture collected in the oral cavity is less than 1 ml / min.

  Table 1 shows the measurement results and the determination based on the above evaluation criteria.

[Example 1]
A toothbrush 1 having a suction port 51 provided on the distal end surface 22 of the head portion 2 as shown in FIG. 2 was produced, and the above measurement was performed.
Both the amount of water sucked 30 seconds after the start of tooth brushing and the amount of water sucked 3 minutes later were 5 ml / min or more.
The judgment results were ○ for both 30 seconds after starting brushing and after 3 minutes.

[Example 2]
A toothbrush 11 having a suction port 51 provided on the side surface 24 of the head portion 2 as shown in FIG. 3 was produced, and the above measurement was performed.
Both the amount of water sucked 30 seconds after the start of tooth brushing and the amount of water sucked 3 minutes later were 5 ml / min or more.
The judgment results were ○ for both 30 seconds after starting brushing and after 3 minutes.

[Example 3]
A toothbrush 12 having a suction port 51 provided on the back surface 26 of the head portion 2 as shown in FIG. 4 was produced, and the above measurement was performed.
Both the amount of water sucked 30 seconds after the start of tooth brushing and the amount of water sucked 3 minutes later were 5 ml / min or more.
The judgment results were ○ for both 30 seconds after starting brushing and after 3 minutes.

[Comparative example]
The toothbrush 100 which provided the suction port 151 in the flocking surface 123 of the head part 102 as shown in FIG. 8 was produced, and the said measurement was performed.
The amount of water sucked 30 seconds after the start of tooth brushing was less than 5 ml / minute, and the amount of water sucked after 3 minutes was 1 ml / minute or less.
The judgment result was Δ after 30 seconds from the start of brushing, and x after 3 minutes.

  As in the above results, the toothbrush provided with the suction port at a position other than the flocked surface of the head part is not only immediately after the start of tooth brushing (after 30 seconds from the start), but also in the state where the oral cavity is 3 minutes after the start of tooth brushing In addition, the water accumulated in the oral cavity could be efficiently sucked.

It is the schematic which shows an example of the toothbrush of this invention. It is the schematic which shows the principal part of the toothbrush shown in FIG. It is the schematic which shows the other example of the toothbrush of this invention. It is the schematic which shows the other example of the toothbrush of this invention. It is the schematic which shows the other example of the toothbrush of this invention. It is the schematic which shows the other example of the toothbrush of this invention. It is the schematic which shows an example of the usage condition of the toothbrush of this invention. It is the schematic explaining the conventional toothbrush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 12, 13 ... Toothbrush, 2 ... Head part, 22 ... Tip surface, 23 ... Flocking surface, 3, 31 ... Neck part, 4, 41 ... Grasping part, 5 ... Discharge passage, 51, 53, 54 ... Suction Mouth, 52 ... discharge port, 8 ... vent

Claims (3)

A toothbrush having a head portion in which a brush body is implanted, a neck portion, and a gripping portion,
At least one or more suction ports are formed at any position other than the flocked surface from the neck to the tip of the head,
A discharge passage is formed so as to penetrate the toothbrush in communication with the suction port, and the suction port expands more than the discharge passage toward the back side opposite to the flocked surface. Provided,
A discharge port is formed at the other end of the discharge passage ,
Furthermore, at least one water supply port for discharging water is provided at any position from the neck portion to the tip of the head portion,
A toothbrush comprising: a water supply passage provided so as to penetrate the inside of the toothbrush in communication with the water supply port; and a water intake port provided at the other end of the water supply passage for receiving water .   The toothbrush according to claim 1, wherein a vent hole communicating with the discharge passage is provided at any position of the neck portion or the grip portion.   The toothbrush according to claim 1 or 2, wherein the neck portion and the grip portion are assembled so as to be detachable.

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