JP3120305U - Brush head and toothbrush having the same - Google Patents

Abstract

A brush head capable of effectively improving the cleaning efficiency of a toothbrush and a toothbrush having the brush head are provided.
A brush head has at least a front end, a rear end, two opposing sides, and bristles, the bristles forming a printing surface, and the printing surface is inclined from one side to the other, thereby The printing surface can be closely applied to the teeth and gingival sulcus. The brush head 1 has a front end 11, a rear end 13, two opposing side portions 15 and 17 (only one side portion 15 is shown), and a plurality of bristles 19. The bristles 19 define a printing surface 191. Is inclined from one side to the other. The printing surface 191 may be inclined from the left side 17 to the right side 15 of the front end 11 and has an outer shape of a parabola, for example, one side is long and the other side is short.
[Selection] Figure 4

Description

  The present invention relates to a tooth cleaning technique, and more particularly, to a brush head used for cleaning teeth and a toothbrush having the same.

  With healthy teeth, we can eat as well as eat normally. Since the oral cavity is filled with various bacteria, plaque is formed in the gingival crevice (between teeth and gingiva) due to the action of bacteria in addition to the mixture of food and saliva. Causes tooth decay.

  More specifically, as the pathogenesis of periodontal disease, plaque and bacteria in the gingival sulcus cannot be washed away cleanly, and once plaque in the gingival sulcus accumulates and calcifies, it becomes a tartar as referred to in dentistry. Once tartar is formed, it becomes more difficult to clean the gingival crevice, which is an early symptom of periodontal disease. And gingival inflammation, bleeding, swelling and pain occur. In this case, periodontal disease progresses one after another unless the dentist promptly removes tartar and plaque. As a result, the alveolar bone of the periodontal tissue is lost, a periodontal pocket is formed, and finally the wobbling of the tooth becomes significant and may come off.

  In addition, the pathogenesis of dental caries is that plaques and bacteria attached to the teeth are metabolized to acidic substances via food in the oral cavity, and the calcified structure of the teeth is demineralized, gradually from the enamel to the ivory. It is caused by erosion into quality. In this case, the process of pulp cells (also called nerves) is formed in the dentinal tubules in the dentin, so cold heat reaches from the dentine to the pulp and inflammation of the pulp occurs. It causes the patient to feel severe pain.

  Therefore, doctors recommend that for oral hygiene health, it is usually necessary to brush teeth four times a day, ie after meals and before going to bed. By doing so, the oral cavity can be cleaned and the oral odor can be eliminated, and tooth lesions can be avoided. An accurate understanding of brushing is necessary for white, healthy and clean teeth. Currently, the most internationally recommended bath toothbrushing method is to brush the tooth root so that the toothbrush and gingiva have an inclination angle of 45 to 60 degrees, and brush the tooth surface up and down. However, although the bath toothbrushing method is effective, the selection of the toothbrush is extremely important in order to make the daily tooth cleaning work healthy and effective.

  In all currently available toothbrushes, as shown in FIGS. 1A and 1B, the toothbrush 10 has a brush head 101 and a handle 103, and many of the bristles 1011 on the brush head 101 have the same length design. It is common. At the same time, as shown in FIG. 2A to FIG. 2C, the differences between the illustrated toothbrushes are mostly the size of the brush head 101 and the angle in front of the brush head 101, and they can be swung freely in the oral cavity. It is for doing so. Among these, as a special design, as shown in FIGS. 3A and 3B, the bristles 2011 in front of the brush head 201 of the toothbrush 20 have a relatively long inclined angle, and are more preferable for the teeth on the centrifugal side. Those that are clean and efficient are known. In addition, among prior art documents, Taiwan Utility Model Publication No. 264649 proposes a toothbrush in which the bristles on the front end and both sides of the brush head are longer than the bristles on the back end and the middle of the brush head. .

  However, in order to use a toothbrush of the same length as the bristles, the cleanliness of the oral cavity cannot be maintained without considerable brushing techniques. Moreover, even if the toothbrush 20 shown in FIGS. 3A and 3B or the utility model toothbrush shown in Taiwan Utility Model Publication No. 264649 is used, the cheek cannot be opened widely by the toothbrush, and the toothbrushes are almost parallel to the teeth. In order to clean the skin, plaques attached to the gingival sulcus and teeth cannot be effectively removed.

  At the same time, the lingual side of the front teeth region of the upper and lower jaws (i.e., the side where the teeth are close to the tongue) is arcuate, which is the blind spot in brushing that is hardest to brush. However, the prior art brush head design cannot simultaneously solve the difficulties due to blind spots in brushing in this region and the demand for cleanness of the mating surfaces.

  As mentioned above, commercially available brush heads and bristles generally have a design that has a significant impact on the efficiency of toothbrush cleaning, and generally do not include oral cleansing techniques like dentists or dental professionals. Therefore, periodontal diseases and caries are prevalent, and dental clinics are also crowded.

  Accordingly, there is a need for the development of a tooth cleaning technique that overcomes the various drawbacks of the prior art described above, that is easy to brush and that can clean the oral cavity without the need for specialized tooth brushing methods.

  Therefore, in view of the above circumstances, the present invention provides a brush head that can effectively improve the cleaning efficiency of a toothbrush and a toothbrush having the same so that the gingival sulcus and teeth can be effectively cleaned. The issue is to provide.

  Another object of the present invention is to provide a brush head that can be easily brushed and can clean the oral cavity without requiring a professional tooth brushing method, and a toothbrush having the brush head.

  Another object of the present invention is to provide a brush head and a toothbrush having the brush head that can simultaneously satisfy the demands for blind spots in toothbrushing and the cleanliness of the meshing surface.

  Moreover, this invention makes it a subject to provide the brush head which can improve the freedom degree in design, and a toothbrush which has the same.

  In order to solve the above-described problems, in the brush head according to the present invention and the toothbrush having the brush head, the brush head has at least a front end, a rear end, two opposing side portions, and bristles, and the bristles define a printing surface. The printing surface is inclined from one side to the other, and the toothbrush further includes the brush head and a handle coupled to the brush head.

  Preferably, the front end has a fixing portion, and the fixing portion is, for example, one of a convex portion or a convex rib, the front end further has a first coupling portion, and the first coupling portion is, for example, a concave portion. The rear end may have a fixing portion, and the fixing portion may be, for example, one of a convex portion or a convex rib, and the rear end may have a second coupling portion, The second coupling part is, for example, a concave part. As a preferred embodiment, the printing surface is inclined from the left side to the right side of the front end, and has an outer shape that is long on one side and short on the other side. In another preferred embodiment, the printing surface is inclined from the right side to the left side of the front end, and has an outer shape that is long on one side and short on the other side. The printing surface may have a parabolic outer shape, and an opening and two concave grooves on both sides of the opening are further provided at the bottom of the brush head.

  The present invention further provides a toothbrush including the brush head and a handle coupled to the brush head. Preferably, the brush head and the handle are integrally formed or separated from each other. The front end of the brush head has a first coupling portion, the rear end of the brush head has a second coupling portion, and the handle is further provided with a receiving portion and a third coupling portion. . The accommodating part may be a concave part.

  In a preferred embodiment, the handle is selectable for coupling to either the front end or the rear end of the brush head, and the third coupling portion is either the first coupling portion or the second coupling portion. It is a convex part for combining corresponding to one, and the 3rd joint part has a convex rib. As another preferred embodiment, the handle is further provided with a fourth coupling portion. A 4th coupling part is a convex part for couple | bonding corresponding to any one of a 1st coupling part or a 2nd coupling part, or another brush head.

  In another preferred embodiment, the housing is further provided with a brush head, which may be the brush head described above or another type of brush head. If the brush head is another type of brush head, the bristles may be soft short bristles. As yet another preferred embodiment, the bottom of the brush head is further provided with an opening and two concave grooves on both sides of the opening, and a joint is extended at the front end of the handle. A pin coupled to the opening, and a convex portion provided on each side of the pin and coupled to the concave groove, and the pin is provided with a slot. Yes.

  Compared to the prior art, the toothbrush according to the present invention has a brush head that forms a printing surface that is long on one side and short on the other side. Problems that require toothbrushing techniques, cannot open the cheeks with a toothbrush, and cannot effectively remove plaque in the gingival sulcus and teeth because the toothbrush cleans the teeth almost in parallel Can be solved. At the same time, according to the present invention, it is possible to effectively clean the arcuate lingual site in the front tooth region of the upper and lower jaws, and in this region, as in the prior art, it is difficult to make a blind spot in brushing and clean the meshing surface. It is possible to solve the problem that the demand cannot be satisfied at the same time. In addition, the brush head and the toothbrush having the brush head according to the present invention can be implemented in various combinations so as to satisfy different design demands.

  As described above, according to the brush head and the toothbrush having the brush head according to the present invention, it is possible to effectively improve the cleaning efficiency of tooth brushing and effectively clean the teeth and gingival crevice, so that tooth brushing is easy. In addition, since the oral cavity can be cleaned without the need for a professional toothbrushing method, it is possible to simultaneously satisfy the demand for blind spots and the cleanliness of the meshing surface in toothbrushing, and further freedom in design. Is improved.

  The following describes an embodiment of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention according to the contents described in the specification. The present invention is not limited to the illustrated embodiment, and various modifications are possible within the scope of the technical idea of the present invention.

  Hereinafter, although this invention is demonstrated in detail based on embodiment, this invention is not limited to these embodiment.

4A to 6 show a first embodiment of a brush head and a toothbrush having the brush head according to the present invention.

  As shown in FIG. 4A, the brush head 1 of this embodiment has a front end 11, a rear end 13, two opposing side portions 15 and 17 (only one side portion 15 is shown), and a plurality of bristles 19, and the bristles. 19 defines a printing surface 191 that is inclined from one side to the other. As shown in FIG. 4B, in the present embodiment, the printing surface 191 may be inclined from the left side 17 to the right side 15 of the front end 11, and has a parabolic outline, for example, one side is long and the other side is short.

  As shown in FIG. 5, the toothbrush 100 includes a brush head 1 and a handle 3 coupled to the brush head. In the present embodiment, the brush head 1 and the handle 3 are integrally formed. However, in other embodiments, the brush head 1 and the handle 3 may be designed to be separated from each other, and the handle 3 is not limited to the structure shown in the present embodiment. Any other handle applied to the toothbrush may be used.

  As shown in FIG. 6, when the brush head 1 according to the present invention and the toothbrush 100 having the brush head 1 are applied, the printing surface 191 of the bristles 19 may be closely contacted with the teeth 5 and the gingival grooves 7. Thus, the user can effectively remove the plaques in the teeth 5 and the gingival sulcus only by vibrating the brush head 1 (toothbrush 100) laterally, like a dentist or a dentist. It is no longer necessary to learn the complex and difficult bath toothpaste to clean the oral cavity.

  As described above, according to the brush head and the toothbrush having the brush head according to the present invention, tooth brushing becomes easier, and the oral cavity can be cleansed without requiring a professional tooth brushing method.

7 and 8 show a second embodiment of a brush head and a toothbrush having the brush head according to the present invention. In order to make the description of the present invention easier to understand, the same or approximate parts as those in the first embodiment are denoted by the same or similar reference numerals, and detailed description thereof is omitted.
The greatest difference between the second embodiment and the first embodiment is that in the second embodiment, another brush head is provided at the end of the toothbrush.

  As shown in FIG. 7, in the present embodiment, a receiving portion 101 is provided at the end of the toothbrush 100 ′, and the receiving portion may be a concave groove for receiving the brush head 1 ′. The front end 11 ′ of the brush head 1 ′ has a fixing part 111 ′, and the rear end 13 ′ of the brush head 1 ′ also has a fixing part 131 ′. In the present embodiment, the brush head 1 may be a brush head in which the direction of inclination of the printing surface is opposite to that of the brush head 1 of the previous embodiment. That is, in the first embodiment, the printing surface 191 of the brush head 1 is inclined from the left side 17 of the front end 11 to the right side 15, and the printing surface of the brush head 1 ′ is inclined from the right side 15 of the front end 11 to the left side 17. Good.

  Further, in order to satisfy the demand for brushing the tongue side in the front teeth region of the upper and lower jaws, the bristles 19 ′ of the brush head 1 ′ employ short hair soft bristles to be housed in the housing portion 101, and one side is According to the design of the printing surface which is long and the other side is short, it is possible to simultaneously solve the problem of blind spot in the brushing of the lingual side of the front tooth region of the upper and lower jaws and the demand for cleanness of the meshing surface. The bristles 19 of the brush head 1 may be other long bristles, but it goes without saying that the present invention is not limited to the bristles of these brush heads.

  As shown in FIG. 8, the fixing portion 111 ′ and the fixing portion 131 ′ are convex portions, convex ribs, or other equivalent structures that are locked to the accommodating portion 101.

  In this way, the brush head 1 can clean the buccal side of the tooth on one side (ie, the side of the buccal side of the tooth) and the lingual side of the other side (ie, the side of the lingual side of the tooth). The buccal side of the tooth on the other side and the lingual side of the tooth on one side (i.e., the teeth facing the other side cleaned by the brush head 1) can be cleaned by the brush head 1 '. .

  When the brush head 1 ′ is not used, the housing portion 101 can hide the brush head 1 ′ from the end of the toothbrush 100 ′. When using the brush head 1 ′, the brush head 1 ′ can be used by simply extruding the brush head 1 ′ as shown in FIG. In this way, the buccal and lingual sides of the teeth on different sides can be cleaned by different brush heads.

  Here, in this embodiment, the brush head 1 and the brush head 1 ′ that can clean different sides of the tooth are described as examples provided at both ends of the toothbrush 100, but in other embodiments, for example, The same brush head 1 or brush head 1 ′ can be provided at both ends of the toothbrush 100 ′, and is not limited to this embodiment.

  In the present embodiment, the fixed brush head 1 and the movable brush head 1 ′ are provided at both ends of the toothbrush 100 ′. In other embodiments, the toothbrush 100 ′ is movable at both ends. A type brush head 1 and a fixed type brush head 1 ′ may be provided. Moreover, the handle | steering-wheel 3 is not limited to what is shown in FIG. 7, Both ends may be bent downward so that it may correspond with the angle of toothpaste.

  Further, in this embodiment, a brush head 1 ′ is provided in which the direction of inclination of the printing surface is opposite to that of the brush head 1. In other embodiments, a general brush head (conventional) is provided at one end of the toothbrush 100 ′. 1A and FIG. 1B, FIG. 3A and FIG. 3B of the technology, or a brush head of a toothbrush as shown in Taiwan Utility Model Publication No. 264649, and the other end of the toothbrush 100 ′ is the brush head 1 or the brush head. Any one of 1 'may be provided. That is, either one of the fixed brush head 1 or the brush head 1 ′ and a movable general brush head are provided at both ends of the toothbrush 100 ′, or movable at both ends of the toothbrush 100 ′. Any one of the brush head 1 or the brush head 1 ′ and a fixed general brush head may be provided, respectively, and the present invention is not limited to this embodiment.

  Further, the shape of the brush head 1 or the brush head 1 ′ may be the shape of the brush head shown in FIGS. 2A to 2C in other embodiments, and is not limited to the above or below embodiments.

  9A to 10B show a third embodiment of a brush head and a toothbrush having the brush head according to the present invention. In order to make the description of the present invention clearer and easier to understand, parts that are the same as or similar to those of the above-described embodiment are denoted by the same or similar reference numerals, and detailed description thereof is omitted.

  The greatest difference between the third embodiment and the above-described embodiment is that in the third embodiment, the brush head is provided in a freely removable form at one end of the toothbrush.

  As shown in FIGS. 9A and 9B, the brush head 1 ″ of this embodiment includes a front end 11, a rear end 13, two opposing side portions 15 and 17, and bristles 19. Each of the front end 11 and the rear end 13 is provided with a first coupling portion 113 and a second coupling portion 133, which may be, for example, a recess. The bristles 19 define a printing surface 191 ″ and may be inclined from the printing surface 191 ″ and the right side 15 to the left side 17 of the front end 11, and have a parabolic outline, for example, one side is long and the other side is short.

  As shown in FIGS. 10A and 10B, the toothbrush 100 ′ of the present embodiment includes a brush head 1 ″ and a handle 3 ′ coupled to the brush head. In the present embodiment, the brush head 1 ″ and the handle 3 ′ may be designed to be separated from each other. A third coupling portion 31 ′ is provided at one end of the handle 3 ′, and the third The coupling part may be a convex part for coupling to the first coupling part 113 and the second coupling part 133, and is engaged with the first coupling part 113 and the second coupling part 133. Convex ribs 311 ′ are provided.

  By changing the third coupling portion 31 ′ to be coupled to the first coupling portion 113 or the third coupling portion 31 ′ to be coupled to the second coupling portion 133, the brush head 1 ″ The position provided on the toothbrush 100 ′ can be changed by 180 degrees. In this way, the buccal side and the lingual side of the teeth on different sides can be cleaned by the same brush head.

  Here, in this embodiment, it has been described by way of example that the brush head 1 '' whose installation position can be changed by 180 degrees is provided at one end of the toothbrush 100 '. In other embodiments, for example, the toothbrush 100' A third coupling portion 31 'and a fourth coupling portion (not shown) are provided at both ends of the handle (that is, both ends of the handle), and the third coupling portion 31' is provided with a brush head '' on the toothbrush 100 '. In order to change the position to be changed by 180 degrees, it may be coupled to the first coupling part 113 or the second coupling part 133, and the fourth coupling part may be a general brush head or the brush head shown in the first embodiment. Needless to say, it may be a convex portion for bonding to 1, and is not limited to this embodiment. Since these changes are conventional techniques, detailed description thereof is omitted.

  11 to 12 show a fourth embodiment of a brush head and a toothbrush having the brush head according to the present invention. In order to make the description of the present invention easier to understand, the same or similar reference numerals are assigned to the same or similar parts as those of the above-described embodiment, and detailed description thereof is omitted.

  The biggest difference between the fourth embodiment and the third embodiment is that, in the fourth embodiment, the brush head is provided at one end of the toothbrush so as to be pivoted so that the position can be changed by 180 degrees. is there.

  As shown in FIG. 11, the brush head 1 is substantially the same as the structure of the first embodiment, but the difference is that the bottom of the brush head 1 of the present embodiment has an opening 12 and both sides of the opening. The two concave grooves 14 are provided. A joint 33 is extended at the front end of the handle 3 ″. The joint 33 is provided on both sides of the pin 35 and the pin 35 to be coupled to the opening 12 and corresponds to the concave groove 14. The pin 35 is coupled to the opening 12 and has a slot 351 substantially at the center so as to provide elasticity necessary for rotating the brush head 1. Is provided.

  After the brush head 1 is coupled to the handle 3 '', the toothbrush 100 '' shown in FIG. 12 can be obtained. In this case, by changing the position of the printing surface by 180 degrees by the rotation of the brush head 1, the buccal side and the lingual side of the teeth on different sides can be cleaned by the same brush head.

  Compared to the prior art, the printing surface of the brush head according to the present invention is inclined from one side of the front end to the other side, and has a parabolic outline, for example, one side is long and the other side is short. Can effectively improve the cleansing of toothpaste, and effective for gingival crevice and teeth, even for general users who do not have specialized oral cleansing techniques such as dentists or dental care workers Can be clean.

  Further, according to the present invention, for example, the surface of the upper and lower jaw front tooth regions can be cleaned corresponding to the lingual side by the printing surface by designing the outer shape of the parabola, so that the region that is difficult to clean is easily and effectively cleaned. Can be. Moreover, while being able to implement | achieve this invention using said different embodiment, it is also possible to add substitution and a change to each embodiment. For example, the brush head of the third embodiment may be replaced with the brush head of the first embodiment, or the brush head of the fourth embodiment may be replaced with the brush head of the second embodiment. Instead of the fitting design of the embodiment and the pin design of the fourth embodiment, a design in which a brush head that can be changed 180 degrees at one end of the toothbrush (that is, the installation position of the printing surface) may be adopted. Therefore, the present invention has various design degrees of freedom.

  As described above, the brush head and the toothbrush having the brush head according to the present invention can effectively improve the cleaning efficiency of the toothpaste, effectively clean the teeth and the gingival crevice, and more easily brush the teeth. In addition, it is possible to clean the oral cavity without the need for specialized tooth brushing methods, and at the same time, it is possible to satisfy the demands for cleansing blind spots and mating surfaces in tooth brushing, further increasing design freedom. Therefore, it has extremely high industrial utility value.

  As described above, these embodiments are shown for the purpose of illustrating the present invention, and the present invention is not limited thereto. The substantial technical contents according to the present invention are defined in the claims for utility model registration. The present invention can be modified in various ways without departing from the scope of claims for utility model registration by those skilled in this technical field.

The block diagram which showed typically the structure of the brush head and toothbrush of a prior art. The block diagram which showed typically the shape of the brush head of a prior art. The block diagram which showed typically the structure of the brush head of other prior art, and a toothbrush. It is the block diagram which showed typically the structure of the brush head of 1st Embodiment of this invention, Comprising: FIG. 4A is a three-dimensional figure, FIG. 4B is the side view which looked at FIG. 4A from the front end. The block diagram which showed typically the structure of the toothbrush of the 1st Embodiment of this invention. The block diagram which showed typically the use condition of the toothbrush of the 1st Embodiment of this invention. It is the block diagram which showed typically the other structure of the brush head of 2nd Embodiment of this invention, and a toothbrush which has it, Comprising: The brush head is incorporated in the end of a toothbrush. It is the block diagram which showed typically the structure of the brush head of 2nd Embodiment of this invention, and a toothbrush having the same, Comprising: The brush head accommodated in the end of the toothbrush has already been mounted | worn on the handle | steering-wheel It is shown that. 9A and 9B are block diagrams schematically showing the structure of a brush head according to a third embodiment of the present invention, in which FIG. 9A is a side view seen from the front end, and FIG. 9B is a side view seen from the rear end. It is the exploded view which showed typically the structure of the brush head of 3rd Embodiment of this invention, and the toothbrush which has it, Comprising: FIG. 10A is a side view, FIG. 10B is a three-dimensional figure. The exploded view which showed typically the structure of the brush head of 4th Embodiment of this invention, and the toothbrush which has the same. The block diagram which showed the assembly of FIG. 11 typically.

Explanation of symbols

1, 1 ′, 1 ″ brush head 11 front end 111 fixing portion 113 first coupling portion 12 opening 13 rear end 131 fixing portion 133 second coupling portion 14 groove 15, 17 side portion 19 bristles 191, 191 ″ Printing surface 3, 3 ′, 3 ″ handle 31 ′ third coupling portion 311 ′ convex rib 33 joint portion 35 pin 351 slot 37 convex portion 5 tooth 7 gingival groove 100, 100 ′, 100 ″ toothbrush 101 housing portion 10 Toothbrush 101 brush head 1011 bristles 103 handle 20 toothbrush 201 brush head 2011 bristles

Claims (29)

  A brush head having at least a front end, a rear end, two opposing side portions, and a plurality of bristles, wherein the bristles form a printing surface, and the printing surface is inclined from one side to the other.   The brush head according to claim 1, wherein the front end has a fixing portion.   The brush head according to claim 2, wherein the fixing portion is a convex portion or a convex rib.   The brush head according to claim 1, wherein the front end has a first coupling portion.   The brush head according to claim 4, wherein the first coupling portion is a recess.   The brush head according to claim 1, wherein the rear end has a fixing portion.   The brush head according to claim 6, wherein the fixing portion is a convex portion or a convex rib.   The brush head according to claim 1, wherein the rear end has a second coupling portion.   The brush head according to claim 8, wherein the second coupling portion is a recess.   The brush head according to claim 1, wherein the printing surface is inclined from the left side to the right side of the front end, and has an outer shape that is long on one side and short on the other side.   The brush head according to claim 1, wherein the printing surface is inclined from the right side to the left side of the front end, and has an outer shape that is long on one side and short on the other side.   The brush head according to claim 1, wherein the printing surface has a parabolic outer shape.   The brush head according to claim 1, further comprising an opening and two concave grooves on both sides of the opening at a bottom of the brush head. A brush head according to claim 1;
A toothbrush comprising a handle coupled to the brush head.   The toothbrush according to claim 14, wherein the brush head and the handle are integrally formed.   The toothbrush according to claim 14, wherein the brush head and the handle are separated from each other.   The front end of the brush head has a first coupling portion, the rear end of the brush head has a second coupling portion, and the handle is further provided with a receiving portion and a third coupling portion. The toothbrush according to claim 14.   The toothbrush according to claim 17, wherein the accommodating portion is further provided with a brush head.   The toothbrush according to claim 18, wherein the bristles of the brush head are soft short bristles.   The toothbrush according to claim 18, wherein the brush head is the brush head according to claim 1.   The toothbrush according to claim 17, wherein the accommodating portion is a concave portion.   The toothbrush according to claim 17, wherein the handle is coupled to a front end or a rear end of the brush head.   The toothbrush according to claim 17, wherein the third coupling portion is a convex portion coupled to correspond to the first coupling portion or the second coupling portion.   The toothbrush according to claim 17, wherein the third coupling portion has a convex rib.   The toothbrush according to claim 14, wherein the handle is further provided with a fourth coupling portion.   The toothbrush according to claim 25, wherein the fourth coupling portion is a convex portion.   The toothbrush according to claim 14, wherein an opening and two concave grooves on both sides of the opening are further provided at a bottom of the brush head, and a joint is provided at a front end of the handle.   The toothbrush according to claim 27, wherein the joint is provided with a pin coupled corresponding to the opening and a convex portion coupled corresponding to the concave groove on both sides of the pin. .   29. A toothbrush according to claim 28, wherein the pin is provided with a slot.

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