A smart toothbrush

Abstract

The present invention relates to the technical field of toiletries, and provides an intelligent toothbrush, including a host, a brace and a control circuit, wherein the host includes a host housing and a driving motor arranged in the host housing, the brace includes a first brace for cleaning the inner and outer tooth surfaces and a second brace arranged in the first brace and used for cleaning the molar surface, the first brace is connected to the first transmission shaft, the second brace is connected to the second transmission shaft, the first transmission shaft and the second transmission shaft are connected to the driving motor, and the control circuit is electrically connected to the driving motor to drive the first transmission shaft and the second transmission shaft to drive the first brace and the second brace to move respectively, and to drive the first transmission shaft and the second transmission shaft to drive the first brace and the second brace to move at the same time. In the present invention, two braces are arranged separately, which reduces the vibration volume of each brace, and then the vibration amount and swing amount of each brace are doubly guaranteed by using a separate driving method, so that the teeth can be cleaned more thoroughly.

Description

Technical Field

[0001] The invention relates to the technical field of toiletries, and in particular provides a smart toothbrush. Background Art

[0002] At present, the smart toothbrushes on the market are mainly designed with a single motor, and there are two main types according to the brush head: traditional brush head type and braces type. The traditional brush head type is similar to the traditional toothbrush, and the brushing method is also similar. You need to use your hands to complete the brushing. The difference is that the brush head of this type of toothbrush is vibrating or swinging. The technology of this type of smart toothbrush is relatively mature, and the brushing experience and effect are also very good. It is the mainstream type of smart toothbrush. The braces type smart toothbrush is also called the "lazy" toothbrush. It is a recent product. Users only need to put the braces into the mouth and bite the braces to automatically complete the brushing. There is no need to use hands to assist in the brushing process. Unlike the traditional brush head type, the braces type is a whole-tooth contact brush. When biting the braces, the bristles cover the inside and outside of the teeth and the grinding surface, and brush the teeth by the vibration and swing of the bristles. The braces brush head is relatively large, and the materials used are mostly soft rubber materials. The transmission efficiency of soft rubber is low. The farther the wheelbase from the motor, the more obvious the vibration attenuation. When using it, the user needs to put the braces in the mouth and bite them. Only by ensuring that the braces have sufficient vibration and swing can the bristles be transmitted to vibrate and swing, so as to ensure that the teeth are brushed cleanly. It is difficult to achieve the requirement by simply connecting the braces to the motor. At present, the braces-type smart toothbrushes on the market basically use braces and motors to connect directly. When the braces are put into the mouth as a whole and bitten, the braces will no longer swing in the mouth, but can only vibrate, and the vibration transmitted to the bristles is very small. When the braces are bitten hard, the vibration of the distal end of the braces basically disappears, and the bristles are basically in a static state, and the effect of brushing teeth cannot be achieved. The user can only experience the vibration of the toothbrush motor, and the teeth are not brushed. After washing, it can only achieve the effect of rinsing the mouth. Therefore, the biggest bottleneck of braces-type smart toothbrushes is that they cannot thoroughly clean and brush teeth and the experience effect is poor, and the main reason is that the vibration and swing amount of the bristles cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to provide a smart toothbrush, aiming to solve the technical problems in the prior art that smart toothbrushes cannot clean teeth thoroughly and the brushing experience is poor.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an intelligent toothbrush, including a main unit, a brace and a control circuit, the main unit including a main unit housing and a driving motor arranged in the main unit housing, the brace including a first brace for cleaning inner and outer tooth surfaces and a second brace arranged in the first brace and used for cleaning molar surfaces, the first brace is connected to a first transmission shaft, the second brace is connected to a second transmission shaft, the first transmission shaft and the second transmission shaft are transmission-connected to the driving motor, the control circuit is electrically connected to the driving motor for respectively driving the first transmission shaft and the second transmission shaft to respectively drive the first brace and the second brace to move, and simultaneously driving the first transmission shaft and the second transmission shaft to drive the first brace and the second brace to move.

[0005] Furthermore, the first braces include a first braces body with a U-shaped cross-section, a mounting groove facing the host housing is provided in the middle of the first braces body, a fixing piece is provided in the mounting groove, and the second braces include a second braces body with a U-shaped cross-section, the second braces body is provided on the inner side of the fixing piece, the first transmission shaft is passed through and fixed in the fixing piece, and the second transmission shaft passes through the fixing piece and is connected to the second braces body.

[0006] Furthermore, the second brace body includes a connecting portion located in the middle, a bite portion respectively arranged at both ends of the connecting portion, and a brush head portion respectively arranged at both ends of the bite portion, the second transmission shaft passes through the fixing member and is fixedly connected to the connecting portion, the top surface of each brush head portion is provided with a second upper bristle for cleaning the grinding surface of the upper teeth, and the bottom surface of each brush head portion is provided with a second lower bristle for cleaning the grinding surface of the lower teeth.

[0007] Furthermore, a step is provided at a connection between each of the bite portions and each of the brush heads, the bite portion being an upper step of the step, and the brush head being a lower step of the step.

[0008] Furthermore, an upper bite groove is provided on the upper surface of the bite portion along its extension direction, and a lower bite groove corresponding to the upper bite groove is provided on the lower surface of the bite portion.

[0009] Furthermore, the first brace body is formed by buckling a first upper brace body with a U-shaped cross-section and a first lower brace body with a U-shaped cross-section, the first upper brace body is provided with first upper bristles for cleaning the inner and outer tooth surfaces of the upper teeth along its inner side, the first lower brace body is provided with first lower bristles for cleaning the inner and outer tooth surfaces of the lower teeth along its inner side, and the second brace body is located between the first upper bristles and the first lower bristles.

[0010] Further, the first upper brace body is provided with an upper brace groove along its inner side, and the first upper bristles include first upper outer bristles arranged along the outer side of the upper brace groove and first upper inner bristles arranged along the inner side of the upper brace groove; the first lower brace body is provided with a lower brace groove along its inner side, and the first lower bristles include first lower outer bristles arranged along the outer side of the lower brace groove and first lower inner bristles arranged along the inner side of the lower brace groove, the upper brace groove and the lower brace groove are connected up and down, and the second brace body is located between the connected upper brace groove and the lower brace groove.

[0011] Further, the first upper outer bristles are arranged upwardly and tilted from the root and toward the inside of the first upper brace body, and the first upper inner bristles are arranged upwardly and tilted from the root and toward the outside of the first upper brace body; the first lower outer bristles are arranged downwardly and tilted from the root and toward the inside of the first lower brace body, and the first lower inner bristles are arranged downwardly and tilted from the root and toward the outside of the first lower brace body.

[0012] Furthermore, the fixing member includes a fixing portion located in the middle and a clamping portion located on both sides of the fixing portion and respectively inclined outward, and the fixing portion is provided with two connecting holes for the first transmission shaft and the second transmission shaft to pass through respectively, and the clamping portions are respectively clamped against the inner wall of the mounting groove.

[0013] Furthermore, there are two drive motors, and both are arranged in the main body housing, and the first transmission shaft and the second transmission shaft are the output shafts of the two drive motors respectively; or, there is one drive motor, and a transmission structure is provided on the output shaft of the drive motor, and the transmission structure is respectively connected to the first transmission shaft and the second transmission shaft.

[0014] Beneficial effects of the present invention:

[0015] In the present invention, two braces are arranged separately, which reduces the vibration volume of each brace, and then a separate driving method is used to doubly ensure the vibration and swing amount of each brace, so that the teeth can be cleaned more thoroughly; due to the separate driving, the same frequency or different frequencies, the same intensity or different intensities can be selected according to the degree of cleaning of the tooth parts; and, by utilizing the control function of the control circuit, a variety of brushing modes can be selected, and two braces can be selected for cleaning at the same time, or only one of the braces can be selected for local focused cleaning. This variety of selectable brushing methods can brush teeth accurately, improve cleanliness, and also bring users a fresh and comfortable use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the structure of a smart toothbrush provided in Embodiment 1 of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0019] Figure 3 A schematic cross-sectional view of a smart toothbrush provided in Embodiment 1 of the present invention;

[0020] Figure 4 A schematic diagram of the connection between the second drive motor and the second dental brace in the smart toothbrush provided in the first embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the connection between a first drive motor and a first dental brace in a smart toothbrush provided in Embodiment 1 of the present invention;

[0022] Among them, the reference numerals in the figure are:

[0023] 100-host; 110-host housing; 111-upper housing; 112-lower housing; 120-first drive motor; 130-second drive motor; 140-partition; 150-accommodation chamber; 200-tooth braces; 210-first tooth braces; 211-first tooth braces body; 212-installation groove; 213-first upper bristles; 2131-first upper outer bristles; 2132-first upper inner bristles; 214-first Lower bristles; 2141-first lower outer bristles; 215-first upper brace body; 216-first lower brace body; 217-upper brace groove; 220-second brace; 221-second brace body; 222-connecting part; 223-brush head; 224-second upper bristles; 225-second lower bristles; 226-biting part; 227-step; 300-fixing piece; 310-fixing part; 320-clamping part. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] Please refer to Figure 1Embodiment 1 of the present invention provides a smart toothbrush, including a host 100, a brace 200 and a control circuit (not shown in the figure). The host 100 includes a host housing 110 and a drive motor disposed in the host housing 110. The brace 200 includes a first brace 210 for cleaning the inner and outer tooth surfaces and a second brace 220 disposed in the first brace 210 and used for cleaning the molar surface. The first brace 210 is connected to the first transmission shaft, and the second brace 220 is connected to the second transmission shaft. In this embodiment, there are two drive motors, which are disposed in the host housing 110. For ease of explanation, they are named as the first drive motor 120 and the second drive motor 130. The first transmission shaft and the second transmission shaft are the output shafts of the first drive motor 120 and the second drive motor 130, respectively. In this embodiment, the output shaft of the first drive motor 120 extends from the main body housing 110 and is fixedly connected to the first brace 210, and the output shaft of the second drive motor 130 extends from the main body housing 110 and is fixedly connected to the second brace 220. The control circuit is electrically connected to the first drive motor 120 and the second drive motor 130 for respectively driving the first drive motor 120 and the second drive motor 130 and driving the first drive motor 120 and the second drive motor 130 simultaneously.

[0030] It should be noted that the connection between the output shaft of the first drive motor 120 and the first brace 210, and the connection between the output shaft of the second drive motor 130 and the second brace 220 can also be a detachable nested connection, a magnetic connection or a gear connection.

[0031] In the embodiment of the present invention, two driving motors are provided, and the first driving motor 120 is used to drive the first brace 210 to clean the inner and outer tooth surfaces, and the second driving motor 130 is used to drive the second brace 220 to clean the molar surface. The two braces are provided separately, thereby reducing the vibration volume of each brace, and then using a separate driving method to doubly ensure the vibration and swing amount of each brace, so that the teeth can be cleaned more thoroughly; since the two driving motors are driven separately, the same frequency or different frequencies can be selected according to the degree of cleaning of the tooth parts; and, using the control function of the control circuit, a variety of brushing modes can be selected, and two braces can be selected for cleaning at the same time, or only one of the braces can be selected for local focused cleaning. This variety of selectable brushing methods can brush teeth accurately, improve cleanliness, and also bring users a fresh and comfortable use experience.

[0032] Combination Figure 2 , Figure 3The first brace 210 includes a first brace body 211 with a U-shaped cross section, a mounting groove 212 facing the main housing 110 is provided in the middle of the first brace body 211, and a fixing member 300 is provided in the mounting groove 212. The second brace 220 includes a second brace body 221 with a U-shaped cross section, and the second brace body 221 is provided on the inner side of the fixing member 300. The inner side here refers to the inner side relative to the oral cavity when the brace 200 is placed in the oral cavity for operation. The output shaft of the first drive motor 120 is passed through and fixed in the fixing member 300, and the output shaft of the second drive motor 130 passes through the fixing member 300 and is fixedly connected to the second brace body 221. By setting the fixing member 300 in the mounting groove 212, and then passing the output shafts of the first drive motor 120 and the second drive motor 130 through the fixing member 300, the fixed connection between the two drive motors and the two braces is achieved.

[0033] Specifically, the fixing member 300 includes a fixing portion 310 located in the middle and a clamping portion 320 located on both sides of the fixing portion 310 and arranged to be tilted outwards. When the fixing member 300 is installed, it is extended outwards from the inner side of the mounting groove 212, that is, the end away from the main body housing 110. When the fixing portion 310 moves into position in the mounting groove 212, the clamping portions 320 on both sides are clamped on the inner wall of the mounting groove 212, so as to prevent the fixing portion 310 from falling off from the mounting groove 212. The fixing portion 310 is provided with two connecting holes (not numbered in the figure) for the output shaft of the first drive motor 120 and the output shaft of the second drive motor 130 to pass through respectively. The above-mentioned fixing member 300 is not only simple in structure, but also easy to install, so as to achieve the purpose of connecting the two drive motors with the two braces 200.

[0034] Reference Figure 2 , Figure 4 In this embodiment, the second brace body 221 includes a connecting portion 222 located in the middle, a bite portion 226 respectively provided at both ends of the connecting portion 222, and a brush head 223 respectively provided at both ends of the bite portion 226. The two brush heads 223, the two bite portions 226 and the connecting portion 222 are connected to form a U-shaped second brace body 221. A connecting hole (not numbered in the figure) is provided on the outside of the connecting part 222, and the output shaft of the second drive motor 130 passes through the fixing piece 300 and extends into the connecting hole to achieve a fixed connection with the connecting part 222. The occlusal part 226 has a certain arc length, which corresponds to the incisors and canines. The molar surface is small, so no bristles are set. The brush head parts 223 located at both ends of the connecting part 222 are opposite to the molars, so the top surface of the brush head part 223 is provided with second upper bristles 224 for cleaning the grinding surface of the middle molar of the upper teeth, and the bottom surface of each bristle part 223 is provided with second lower bristles 225 for cleaning the grinding surface of the middle molar of the lower teeth.

[0035] The second upper bristles 224 and the second lower bristles 225 are both upright on the brush head 223, so that the bristles are relatively perpendicular to the grinding tooth surface, thereby better cleaning the grinding tooth surface.

[0036] Furthermore, each of the bite portions 226 and each of the brush heads 223 is connected to a step 227, wherein the bite portion 226 is an upper step of the step 227 and the brush head 223 is a lower step of the step. Since the bite portion 226 is used to bite the braces and the brush head 223 is used to brush teeth, the design of the step surface enables the brush head 223 to be located between the upper and lower toothbrushes, so as to better clean the grinding tooth surface.

[0037] Furthermore, an upper bite groove (not shown) is provided on the upper surface of the bite portion 226 along its extension direction, and a lower bite groove corresponding to the upper bite groove is provided on the lower surface of the bite portion 226. When brushing teeth, the upper and lower incisors and the upper and lower canines bite into the upper bite groove and the lower bite groove respectively to prevent the mouthpiece 200 from sliding in the oral cavity when the mouthpiece 200 vibrates or swings.

[0038] In this embodiment, in order to facilitate the installation of the second brace body 221 and also facilitate the processing and forming of the first brace body 211, the first brace body 211 is composed of two parts, that is, the first brace body 211 is formed by buckling a first upper brace body 215 with a U-shaped cross section and a first lower brace body 216 with a U-shaped cross section. The first upper brace body 215 is provided with a first upper bristle 213 for cleaning the inner and outer tooth surfaces of the upper teeth along its inner side, and the first lower brace body 216 is provided with a first lower bristle 214 for cleaning the inner and outer tooth surfaces of the lower teeth along its inner side, and the second brace body 221 is located between the first upper bristle 213 and the first lower bristle 214. In this way, the first upper bristle 213 corresponds to the upper teeth, the first lower bristle 214 corresponds to the lower teeth, and the second brace body 221 is correspondingly located between the upper teeth and the lower teeth, just to clean the grinding tooth surface.

[0039] Specifically, refer to Figure 2 , Figure 5 The first upper brace body 215 is provided with an upper brace groove 217 along its inner side, and the first upper bristles 213 include first upper outer bristles 2131 arranged along the outer side of the upper brace groove 217 and first upper inner bristles 2132 arranged along the inner side of the upper brace groove 217; the first lower brace body 216 is provided with a lower brace groove (not shown in the figure) along its inner side, and the first lower bristles 214 include first lower outer bristles 2141 arranged along the outer side of the lower brace groove and first lower inner bristles (not shown in the figure) arranged along the inner side of the lower brace groove, and the upper brace groove 217 is connected with the lower brace groove from top to bottom, and the second brace body 221 is located between the connected upper brace groove 217 and the lower brace groove. When brushing teeth, the upper and lower teeth enter the bite portion 226 of the second brace along the upper brace groove 217 and the lower brace groove respectively to bite the second brace to prevent the brace 200 from sliding.

[0040] Specifically, by Figure 4 It can be seen that the first upper outer bristles 2131 are arranged to be tilted upward from the root and toward the inside of the first upper brace body 215, and the first upper inner bristles 2132 are arranged to be tilted upward from the root and toward the outside of the first upper brace body 215; and the first lower outer bristles 2141 are arranged to be tilted downward from the root and toward the inside of the first lower brace body 216, and the first lower inner bristles are arranged to be tilted downward from the root and toward the outside of the first lower brace body 216. In this way, a constricted cleaning space is formed between the first upper inner bristles 2132 and the first upper outer bristles 2131, and the upper teeth are correspondingly located in the cleaning space. This constriction forms a clamping shape, so that the first upper inner bristles 2132 and the first upper outer bristles 2131 are in close contact with the inner and outer tooth surfaces of the upper teeth. When the first drive motor 120 is working, the first upper inner bristles 2132 and the first upper outer bristles 2131 rub and vibrate on the inner and outer surfaces of the upper teeth at a high frequency, which can thoroughly remove dirt on the tooth surface and the gaps between teeth; and a constricted cleaning space is also formed between the first lower inner bristles and the first lower outer bristles 2141, which also achieves the above-mentioned effect.

[0041] Further, refer to Figure 2 In this embodiment, the main body housing 110 includes an upper housing 111 and a lower housing 112 that are detachably connected. A partition 140 is provided in the lower housing 112. The partition 140 divides the interior of the main body housing 110 into two accommodating chambers 150. The first drive motor 120 and the second drive motor 130 are respectively placed in the two accommodating chambers 150. In this way, the partition 140 also limits the first drive motor 120 and the second drive motor 130, and also makes the internal structure of the main body housing 110 more neat.

[0042] The working principle of the smart toothbrush provided in the present invention is as follows: put the toothbrush cover 200 into the oral cavity, start the host 100, select a brushing mode, and the user can choose the first cover 210 and the second cover 220 to brush the teeth at the same time. At this time, the first drive motor 120 and the second drive motor 130 work at the same time. The first drive motor 120 and the second drive motor 130 can choose the same working frequency or different working frequencies. Due to the different structures of the inner and outer surfaces of the teeth and the molar surface, the inner and outer surfaces of the teeth and the molar surface cannot be brushed clean at the same time. In this case, in order to avoid over-brushing of a certain part, the drive motor that has completed the cleaning work can be turned off, and the other drive motor continues to work to brush the teeth until the cleaning is thorough; the user can also directly choose to brush the inner and outer surfaces of the teeth or the molar surface according to their own situation, that is, directly choose to turn on one of the drive motors. In this way, through a variety of brushing methods, not only accurate brushing can be achieved, but also the dirt on the tooth surface, tooth gap and molar surface can be removed more thoroughly, and the problem of unclean and incomplete brushing can be effectively solved; and a variety of user experience options are provided to the user.

[0043] Embodiment 2

[0044] In the present invention, a smart toothbrush (not shown) is also provided, which is different from the first embodiment in that the drive motor is a drive motor with a transmission structure on its output shaft, and the transmission structure is fixedly connected to the first transmission shaft and the second transmission shaft respectively. Through the combination of a drive motor and the transmission structure, it is also possible to drive the two transmission shafts separately or simultaneously to drive the two braces to work. Specifically, the transmission structure is a transmission structure that is more commonly used in the prior art, and will not be described in detail here. The parts not described in this embodiment are the same as those in the embodiment, and will not be described in detail here.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A smart toothbrush, comprising a host, a toothbrush cap and a control circuit, wherein the host comprises a host housing and a driving motor arranged in the host housing, characterized in that: The mouthpiece includes a first mouthpiece for cleaning the inner and outer tooth surfaces and a second mouthpiece arranged in the first mouthpiece and used for cleaning the molar surface, the first mouthpiece is connected to a first transmission shaft, the second mouthpiece is connected to a second transmission shaft, the first transmission shaft and the second transmission shaft are transmission-connected to the driving motor, the control circuit is electrically connected to the driving motor to respectively drive the first transmission shaft and the second transmission shaft to respectively drive the first mouthpiece and the second mouthpiece to move, and simultaneously drive the first transmission shaft and the second transmission shaft to drive the first mouthpiece and the second mouthpiece to move; The first brace comprises a first brace body with a U-shaped cross section, a mounting groove facing the main body shell is provided in the middle of the first brace body, a fixing piece is provided in the mounting groove, the second brace comprises a second brace body with a U-shaped cross section, the second brace body is provided inside the fixing piece; the first brace body is formed by buckling a first upper brace body with a U-shaped cross section and a first lower brace body with a U-shaped cross section, the first upper brace body is provided with a first upper bristle for cleaning the inner and outer tooth surfaces of the upper teeth along its inner side, the first lower brace body is provided with a first lower bristle for cleaning the inner and outer tooth surfaces of the lower teeth along its inner side, and the second brace body is located between the first upper bristle and the first lower bristle; The fixing member comprises a fixing portion located in the middle and clamping portions located at both sides of the fixing portion and arranged to be inclined outwards respectively.

2. The smart toothbrush according to claim 1, characterized in that: The first transmission shaft is passed through and fixed in the fixing member, and the second transmission shaft passes through the fixing member and is connected to the second brace body.

3. The smart toothbrush according to claim 2, characterized in that: The second brace body includes a connecting portion located in the middle, a bite portion respectively arranged at both ends of the connecting portion, and a brush head portion respectively arranged at both ends of the bite portion, the second transmission shaft passes through the fixing member and is fixedly connected to the connecting portion, the top surface of each brush head portion is provided with a second upper bristle for cleaning the grinding surface of the upper teeth, and the bottom surface of each brush head portion is provided with a second lower bristle for cleaning the grinding surface of the lower teeth.

4. The smart toothbrush according to claim 3, characterized in that: A step is provided at a connection between each of the bite portions and each of the brush heads, wherein the bite portion is an upper step of the step and the brush head is a lower step of the step.

5. The smart toothbrush according to claim 4, characterized in that: An upper bite groove is provided on the upper surface of the bite portion along its extending direction, and a lower bite groove corresponding to the upper bite groove is provided on the lower surface of the bite portion.

6. The smart toothbrush according to claim 5, characterized in that: The first upper brace body is provided with an upper brace groove along its inner side, and the first upper bristles include first upper outer bristles arranged along the outer side of the upper brace groove and first upper inner bristles arranged along the inner side of the upper brace groove; the first lower brace body is provided with a lower brace groove along its inner side, and the first lower bristles include first lower outer bristles arranged along the outer side of the lower brace groove and first lower inner bristles arranged along the inner side of the lower brace groove, the upper brace groove and the lower brace groove are connected vertically, and the second brace body is located between the connected upper brace groove and the lower brace groove.

7. The smart toothbrush according to claim 6, characterized in that: The first upper outer bristles are arranged upwardly and tilted from the root and toward the inside of the first upper brace body, and the first upper inner bristles are arranged upwardly and tilted from the root and toward the outside of the first upper brace body; the first lower outer bristles are arranged downwardly and tilted from the root and toward the inside of the first lower brace body, and the first lower inner bristles are arranged downwardly and tilted from the root and toward the outside of the first lower brace body.

8. The smart toothbrush according to claim 1, characterized in that: The fixing portion is provided with two connection holes for the first transmission shaft and the second transmission shaft to pass through respectively, and the clamping portions are respectively clamped against the inner walls of the mounting grooves.

9. A smart toothbrush according to any one of claims 1 to 8, characterized in that: There are two drive motors, and both are arranged in the main body housing, and the first transmission shaft and the second transmission shaft are the output shafts of the two drive motors respectively; or, there is one drive motor, and a transmission structure is provided on the output shaft of the drive motor, and the transmission structure is connected to the first transmission shaft and the second transmission shaft respectively.

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