Tooth cleaning device

Abstract

The embodiment of the present application discloses a tooth cleaning device, which comprises an air pump, a pressure stabilizing gas reservoir, a powder reservoir, a control valve, a liquid pump and a nozzle assembly; the air pump is connected to the pressure stabilizing gas reservoir; the pressure stabilizing gas reservoir and the nozzle assembly are provided with the powder reservoir and the control valve therebetween; the control valve can be selectively switched between a first state and a second state; when the control valve is in the first state, the pressure stabilizing gas reservoir can deliver the pressure-stabilized high-pressure airflow to the powder reservoir, and mix the pressure-stabilized high-pressure airflow with the tooth cleaning powder stored in the powder reservoir to form a powder mixed airflow, and the powder mixed airflow is continuously delivered to the nozzle assembly; when the control valve is in the second state, the pressure-stabilized high-pressure airflow delivered by the pressure stabilizing gas reservoir does not enter the powder reservoir, but is directly delivered to the nozzle assembly; the liquid pump is connected to the nozzle assembly, and is used to deliver liquid to the nozzle assembly; and the nozzle assembly is used to spray the pressure-stabilized high-pressure airflow / powder mixed airflow and the liquid delivered by the liquid pump.

Description

Technical Field

[0001] This application belongs to the field of oral hygiene equipment technology, specifically relating to teeth cleaning devices. Background Technology

[0002] Oral hygiene is a crucial aspect of maintaining oral health. Air polishing, as a highly efficient method of cleaning tooth surfaces, is widely used in both home and clinical settings. Air-polished scalers use a three-phase mixture of air, liquid, and powder to remove plaque, tartar, and stains through the physical abrasive action of the powder particles. They offer advantages such as high cleaning efficiency and minimal damage to tooth surfaces, making them a mainstream oral hygiene device.

[0003] Most existing powder-spraying dental irrigators use piston-type air pumps as their air source. While these pumps are simple in structure and low in cost, they exhibit significant pressure pulsations during operation, resulting in unstable output air pressure. This leads to large fluctuations in spray force and uneven powder output, affecting both cleaning effectiveness and user experience. Furthermore, piston-type air pumps tend to carry moisture when compressing air, which can cause the powder to become damp and clump together after entering the powder pipeline, exacerbating blockages in the pipeline and nozzle.

[0004] Regarding powder delivery and pipeline cleaning, current products generally lack independent self-cleaning purging mechanisms. Powder residue in the pipelines and nozzles cannot be removed promptly after use, and long-term accumulation can solidify and clog, causing poor powder delivery or even complete machine malfunction. The internal structure of the powder tank is poorly designed, causing powder to easily bridge at the outlet, leading to powder delivery interruptions and inconsistent powder output, affecting continuous and stable operation. Furthermore, existing equipment generally lacks reliable backflow prevention structures. When the machine stops or the air pressure drops, powder can easily flow back into the air system under negative pressure, causing air contamination, valve jamming, and pipeline blockage, shortening equipment lifespan and increasing maintenance costs. Summary of the Invention

[0005] This application provides a dental cleaning device, including an air pump, a pressure regulator, a powder storage tank, a control valve, a liquid pump, and a nozzle assembly; The air pump is connected to the pressure-stabilizing air receiver. The air pump is used to deliver high-pressure airflow to the pressure-stabilizing air receiver, and the pressure-stabilizing air receiver is used to stabilize the high-pressure airflow delivered by the air pump. A powder reservoir and a control valve are installed between the pressure-stabilizing gas reservoir and the nozzle assembly. The control valve can selectively switch between a first state and a second state. When the control valve is in the first state, the pressure-stabilizing gas reservoir can deliver the stabilized high-pressure airflow to the powder reservoir, where it mixes with the dental cleaning powder stored in the powder reservoir to form a powder-mixed airflow. The powder-mixed airflow then continues to be delivered to the nozzle assembly. When the control valve is in the second state, The regulated high-pressure gas flow delivered by the pressure-stabilizing gas storage device does not enter Powder storage container, and Directly delivered to the nozzle assembly; The liquid pump is connected to The nozzle assembly includes a liquid pump used to deliver liquid to the nozzle assembly. The nozzle assembly is used to spray out the regulated high-pressure airflow / powder mixture along with the liquid delivered by the liquid pump.

[0006] In some embodiments, the dental cleaning device is provided with a first connecting air passage, a second connecting air passage, a third connecting air passage, a fourth connecting air passage, and a fifth connecting air passage. One end of the first connecting air passage is connected to a pressure-stabilizing air reservoir, and the other end of the first connecting air passage is simultaneously connected to one end of the second connecting air passage and one end of the third connecting air passage. The other end of the second connecting air passage is connected to a powder reservoir. One end of the fourth connecting air passage is connected to a nozzle assembly, and the other end of the fourth connecting air passage is simultaneously connected to the other end of the third connecting air passage and one end of the fifth connecting air passage. The other end of the fifth connecting air passage is connected to the powder reservoir. The control valve is located in the third connecting air passage. When the control valve is in the first state, the third connecting air passage is blocked. When the control valve is in the second state, the third connecting air passage is connected.

[0007] In some embodiments, the pressure-stabilizing gas storage device includes a first tank and a first outlet pipe. The first tank contains desiccant, and the first outlet pipe is connected to the first tank. A first air inlet is provided at the bottom of the first tank, and the first outlet pipe is located at the bottom of the first tank. One end of the first outlet pipe is located outside the first tank, and the other end of the first outlet pipe is located inside the first tank and is higher than the filling height of the desiccant in the first tank.

[0008] In some embodiments, the dental cleaning device further includes a noise reduction filter, an air pump connected to the noise reduction filter, the noise reduction filter being used to reduce the noise of the passing airflow, and the air pump drawing gas through the noise reduction filter.

[0009] In some embodiments, the dental cleaning device further includes a reservoir, a liquid pump connected to the reservoir, the reservoir for storing liquid, and the liquid pump for drawing the liquid stored in the reservoir and delivering it to the nozzle assembly.

[0010] In some embodiments, the powder storage device includes a second tank and a pressure check valve. The second tank stores dental cleaning powder, and the second tank is provided with a second air inlet connected to a second connecting air passage. The second air inlet or the second connecting air passage is provided with a pressure check valve. When the control valve is in the first state, the pressure stabilizing gas storage device delivers the stabilized high-pressure gas flow to the second connecting air passage through the first connecting air passage. The pressure check valve can automatically open after the gas pressure reaches a certain value, so that the stabilized high-pressure gas flow enters the second tank through the second air inlet.

[0011] In some embodiments, the dental powder is one or more of sodium bicarbonate, glycine, and erythritol; and / or, the pressure check valve automatically closes when the pressure falls below a certain value.

[0012] In some embodiments, the second air inlet is disposed at the bottom end of the second can, and the bottom end of the second can is inclined toward the second air inlet so that the dental powder gathers toward the second air inlet under the action of gravity.

[0013] In some embodiments, the powder reservoir further includes a second vent pipe connected to a fifth communication air passage. The second vent pipe is disposed at the bottom end of the second container and extends into the second container. The end of the second vent pipe extending into the second container is at least higher than the dental powder.

[0014] In some embodiments, the dental cleaning device also includes a handle, and a nozzle assembly is disposed on the handle.

[0015] Compared with the prior art, the dental cleaning device of this application can control the opening and closing of the control valve to achieve switching between a first state and a second state. In the first state, the gas passes through the powder storage tank and mixes with the cleaning powder therein before being sprayed out by the nozzle assembly to clean the user's teeth. In the second state, the gas does not pass through the powder storage tank and blows out the cleaning powder remaining in the pipeline, achieving self-cleaning of the pipeline. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a teeth cleaning device according to an embodiment of this application.

[0018] Figure 2 for Figure 1 The image shows a three-dimensional view of the dental cleaning device behind its concealed housing.

[0019] Figure 3 for Figure 1 Another perspective view of the dental cleaning device shown, hidden behind its housing.

[0020] Figure 4 for Figure 1 Another perspective view of the dental cleaning device shown, hidden behind its housing.

[0021] Figure 5 for Figure 1 The diagram shows the internal structure of the pressure-stabilizing gas reservoir in the dental cleaning device.

[0022] Figure 6 for Figure 1 The diagram shows the internal structure of the powder reservoir in the dental cleaning device. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] First, in the description of the embodiments of this application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Secondly, the terms "first," "second," and "third" are used only to distinguish descriptions and have no order or distinction of importance. They should not be interpreted as indicating or implying relative importance. Features marked "first" or "second" may explicitly or implicitly include one or more of the same feature.

[0028] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted; the term "along a certain direction" does not imply that it must be absolutely parallel to that direction, but can be offset, that is, it can have a component in that direction.

[0029] Please see Figure 1-6The dental cleaning device 100 of this application embodiment includes a housing 100a, an air pump 10, a pressure-stabilizing air reservoir 20, a powder reservoir 30, a control valve 40, a liquid pump 50, and a nozzle assembly 60. The dental cleaning device 100 consists of three main parts: an air system, a water system, and a powder delivery system. The air pump 10, the pressure-stabilizing air reservoir 20, the powder reservoir 30, the control valve 40, and the nozzle assembly 60 sequentially constitute the air path and the powder delivery path, while the liquid pump 50 constitutes the water system. The three media, air, powder, and water, are finally collected in the nozzle assembly 60, mixed, and then sprayed out to form a moist dental cleaning powder jet, which balances cleaning effect and operating comfort.

[0030] Air pump 10 is connected to pressure stabilizing gas reservoir 20, and air pump 10 is used to deliver high-pressure gas flow to pressure stabilizing gas reservoir 20. Air pump 10 can be a piston type air pump, which has inherent pressure pulsation during operation.

[0031] The pressure-stabilizing air receiver 20 is used to stabilize the high-pressure airflow delivered by the air pump 10. Its internal volume acts as a buffer chamber, absorbing the periodic pressure fluctuations generated by the piston-type air pump, thus ensuring a stable and uniform air pressure output to the downstream pipeline, thereby guaranteeing a continuous and stable spray force from the nozzle assembly 60. Preferably, in some embodiments, the pressure-stabilizing air receiver 20 is filled with a desiccant to remove moisture from the compressed air, preventing humid gas from causing the dental powder to clump or clog the pipeline.

[0032] A powder reservoir 30 and a control valve 40 are disposed between the pressure-stabilizing air reservoir 20 and the nozzle assembly 60. The control valve 40 can selectively switch between a first state and a second state to achieve two working modes: powder-carrying spray and self-cleaning purging. When the control valve 40 is in the first state, the pressure-stabilizing air reservoir 20 can deliver the stabilized high-pressure airflow to the powder reservoir 30, where it mixes with the dental cleaning powder stored in the powder reservoir 30 to form a powder-mixed airflow. The powder-mixed airflow is then delivered to the nozzle assembly 60 to achieve powder-carrying dental cleaning treatment. When control valve 40 is in the second state The regulated high-pressure gas flow delivered by the pressure-stabilizing gas storage device 20 does not enter Powder storage container 30, and It is directly delivered to the nozzle assembly 60, forming a pure high-speed blowing airflow that thoroughly blows out the residual powder inside the pipeline and nozzle assembly 60, achieving self-cleaning of the pipeline and effectively preventing residual powder from clogging the pipeline due to moisture.

[0033] Liquid pump 50 is connected to The nozzle assembly 60 and the liquid pump 50 are used to deliver liquid (such as water or dental cleaning liquid) to the nozzle assembly 60, where it is mixed with high-pressure gas flow or powder mixing gas flow from the air passage inside the nozzle assembly 60 to form a two-phase gas-liquid or three-phase gas-liquid-powder spray medium.

[0034] The nozzle assembly 60 can spray out the regulated high-pressure airflow / powder mixture along with the liquid delivered by the liquid pump 50 to clean the user's oral cavity and teeth or to achieve self-cleaning of the pipeline.

[0035] like Figure 4 As shown, in some embodiments, to specifically implement the above-mentioned air path switching and mode control functions, the dental cleaning device 100 is provided with a first connecting air path 40a, a second connecting air path 40b, a third connecting air path 40c, a fourth connecting air path 40d, and a fifth connecting air path 40e, each connecting air path forming a complete airflow distribution network. One end of the first connecting air path 40a is connected to the pressure-stabilizing air reservoir 20, which serves as a pressure-stabilizing air source. The other end of the first connecting air path 40a is simultaneously connected to one end of the second connecting air path 40b and one end of the third connecting air path 40c, forming an airflow distribution node. The other end of the second connecting air path 40b is connected to the powder reservoir 30, serving as the air inlet of the powder canister. One end of the fourth connecting air path 40d is connected to the nozzle assembly 60. The other end of the fourth connecting air path 40d is simultaneously connected to the other end of the third connecting air path 40c and one end of the fifth connecting air path 40e. The other end of the fifth connecting air path 40e is connected to the powder reservoir 30, serving as the output channel for the powder mixing airflow.

[0036] The control valve 40 is located in the third connecting air passage 40c and serves as the core switching element of the entire airflow distribution network. When the control valve 40 is in the first state, it blocks the third connecting air passage 40c. The high-pressure airflow from the pressure-stabilizing gas reservoir 20 cannot directly reach the nozzle through the third connecting air passage 40c and is forced to enter the powder storage tank 30 via the second connecting air passage 40b. After carrying powder, it flows from the fifth connecting air passage 40e through the fourth connecting air passage 40d to the nozzle assembly 60. When the control valve 40 is in the second state, it connects the third connecting air passage 40c, providing a low-resistance shortcut for the airflow to reach the nozzle. The airflow no longer passes through the powder storage tank 30 and directly purges the pipeline and nozzle.

[0037] like Figure 5 As shown, in some embodiments, to simultaneously achieve the dual functions of pressure stabilization and drying within a compact space, the pressure-stabilizing gas storage device 20 includes a first tank 21 and a first outlet pipe 22. The first tank 21 stores desiccant, and the first outlet pipe 22 is connected to the first tank 21. A first air inlet 21a is provided at the bottom end of the first tank 21, and the first outlet pipe 22 is also provided at the bottom end of the first tank 21, located at the same end of the tank as the first air inlet 21a, resulting in a compact overall structure. One end of the first outlet pipe 22 is located outside the first tank 21, and the other end of the first outlet pipe 22 is located inside the first tank 21 and is higher than the filling height of the desiccant in the first tank 21, ensuring that the output gas is clean and pressure-stabilized gas after being fully treated by the desiccant inside the tank, and preventing undried moisture from being directly discharged.

[0038] like Figure 1-4 As shown, in some embodiments, to reduce operating noise and ensure air intake cleanliness, the dental cleaning device 100 further includes a noise reduction filter 70, to which the air pump 10 is connected. The noise reduction filter 70 is used to reduce noise and filter the passing airflow. The air pump 10 draws in external gas through the noise reduction filter 70, reducing intake noise at the source and filtering impurities in the air to provide a clean compressed air source for the system.

[0039] like Figure 1-4 As shown, in some embodiments, to achieve a continuous and stable liquid supply, the dental cleaning device 100 further includes a reservoir 80, to which a liquid pump 50 is connected. The reservoir 80 is used to store liquid, and the liquid pump 50 is used to draw the liquid stored in the reservoir 80, pressurize it, and deliver it to the nozzle assembly 60 for mixing with the medium from the air path.

[0040] like Figure 4 and Figure 6 As shown, in some embodiments, to achieve effective storage, transportation, and backflow prevention of the powder, the powder storage device 30 includes a second tank 31 and a pressure check valve 32. The second tank 31 stores dental cleaning powder and is provided with a second air inlet 31a connected to the second connecting air passage 40b. A pressure check valve 32 is provided at the second air inlet 31a or the second connecting air passage 40b. This pressure check valve 32 is made of soft rubber and has a certain opening pressure threshold, ensuring reliable opening under normal operating air pressure and timely closure when air supply is interrupted. When the control valve 40 is in the first state, the pressure-stabilizing gas reservoir 20 transports the stabilized high-pressure gas flow to the second connecting air passage 40b via the first connecting air passage 40a. When the pressure in the gas path gradually rises and reaches a certain value due to the control valve 40 blocking the main flow, the pressure check valve 32 is automatically opened, allowing the high-pressure gas flow after pressure stabilization to enter the interior of the second tank 31 through the second air inlet 31a, where it mixes with the powder inside the tank to form a powder mixed gas flow.

[0041] In some embodiments, regarding the selection of powder materials and the reverse closing characteristics of the valve, the dental cleaning powder is preferably a fine-particle powder with good biocompatibility and safety for the human body, such as sodium bicarbonate, glycine, and erythritol. The pressure check valve 32 automatically closes when the air pump stops, the control valve 40 switches states, or the system air pressure drops below a certain value. Utilizing the elasticity of its soft rubber material and the disappearance of the gas pressure difference, it physically seals the second air inlet 31a, preventing the powder in the powder storage container 30 from flowing back up the upstream air path along the air inlet path, thus avoiding contamination of the air path system.

[0042] like Figure 6As shown, in some embodiments, to ensure continuous and smooth powder supply to the air inlet and avoid powder supply interruption, the second air inlet 31a is located at the bottom of the second tank 31. The bottom of the second tank 31 is inclined towards the second air inlet 31a, forming a conical or sloping powder-collecting bottom surface that gradually narrows from the tank wall to the center. This inclined slope structure allows the dental cleaning powder to continuously and automatically gather at the second air inlet 31a, located at the lowest point, under the combined action of its own gravity and the micro-vibration of the equipment operation. This ensures that there is always sufficient powder surrounding the second air inlet 31a, preventing powder supply interruption due to powder being blown away or bridging.

[0043] like Figure 4 and Figure 6 As shown, in some embodiments, to achieve orderly discharge of the air-powder mixture, the powder storage unit 30 further includes a second vent pipe 33 connected to the fifth connecting air passage 40e. The second vent pipe 33 is located at the bottom end of the second tank 31 and extends into the second tank 31. To prevent powder from being directly sucked into the vent pipe and causing blockage, the end of the second vent pipe 33 extending into the second tank 31 is at least higher than the surface of the dental powder accumulation, ensuring that the vent port is always in free space above the powder surface. Utilizing the characteristic that the powder in the air-powder mixture is carried upward by the airflow, the powder flows out from the high-level port with the airflow, rather than being statically submerged and sucked in.

[0044] like Figure 1-4 As shown, in some embodiments, to facilitate operation, the dental cleaning device 100 also includes a handle 90, and a nozzle assembly 60 is disposed at the front end of the handle 90. The operator can hold the handle 90 with one hand to perform dental cleaning operations, which facilitates control of the spray angle and direction.

[0045] Compared with existing technologies, the teeth cleaning device of this application achieves flexible switching between a first state and a second state by controlling the on / off switching of the control valve 40. In the first state, gas passes through the powder storage tank 30 and mixes with the cleaning powder stored therein before being sprayed out by the nozzle assembly 60 to clean the user's teeth. In the second state, the gas does not pass through the powder storage tank 30, but directly blows out the cleaning powder remaining in the pipeline through a bypass path, achieving self-cleaning of the pipeline and fundamentally solving the problems of easy clogging and powder residue in existing teeth cleaning devices.

[0046] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. However, they cannot be used to limit the scope of this application. Therefore, equivalent variations made within the scope of this application are still within the scope of this application.

Claims

1. A teeth cleaning device, characterized in that, Includes air pump, pressure stabilizing air reservoir, powder storage tank, control valve, liquid pump and nozzle assembly; The air pump is connected to the pressure-stabilizing gas storage device. The air pump is used to deliver high-pressure gas flow to the pressure-stabilizing gas storage device, and the pressure-stabilizing gas storage device is used to stabilize the high-pressure gas flow delivered by the air pump. The powder storage tank and the control valve are disposed between the pressure-stabilizing gas storage device and the nozzle assembly. The control valve can selectively switch between a first state and a second state. When the control valve is in the first state... The The pressure-stabilizing gas reservoir delivers the stabilized high-pressure gas flow to the powder reservoir, where it mixes with the dental cleaning powder stored in the powder reservoir to form a powder-mixed gas flow. This powder-mixed gas flow then continues to be delivered to the nozzle assembly. When the stated When the control valve is in the second state, the The regulated high-pressure gas flow delivered by the pressure-stabilizing gas storage device does not enter The powder The last memory, and Directly supplied to the nozzle assembly; The liquid pump is connected to the A nozzle assembly, wherein the liquid pump is used to deliver liquid to the nozzle assembly; The nozzle assembly is used to spray the stabilized high-pressure airflow / powder mixture together with the liquid delivered by the liquid pump.

2. The dental cleaning device as described in claim 1, characterized in that, The dental cleaning device is provided with a first connecting air passage, a second connecting air passage, a third connecting air passage, a fourth connecting air passage, and a fifth connecting air passage. One end of the first connecting air passage is connected to the pressure-stabilizing air reservoir, and the other end of the first connecting air passage is simultaneously connected to one end of the second connecting air passage and one end of the third connecting air passage. The other end of the second connecting air passage is connected to the powder reservoir. One end of the fourth connecting air passage is connected to the nozzle assembly, and the other end of the fourth connecting air passage is simultaneously connected to the other end of the third connecting air passage and one end of the fifth connecting air passage. The other end of the fifth connecting air passage is connected to the powder reservoir. The control valve is located in the third connecting air passage. When the control valve is in the first state, it blocks the third connecting air passage. When the control valve is in the second state, it connects the third connecting air passage.

3. The dental cleaning device as described in claim 1, characterized in that, The pressure-stabilizing gas storage device includes a first tank and a first gas outlet pipe. The first tank contains desiccant, and the first gas outlet pipe is connected to the first tank. A first air inlet is provided at the bottom of the first tank, and the first gas outlet pipe is located at the bottom of the first tank. One end of the first gas outlet pipe is located outside the first tank, and the other end of the first gas outlet pipe is located inside the first tank and is higher than the filling height of the desiccant in the first tank.

4. The dental cleaning device as described in claim 1, characterized in that, It also includes a noise reduction filter, the air pump is connected to the noise reduction filter, the noise reduction filter is used to reduce the noise of the passing airflow, and the air pump draws gas through the noise reduction filter.

5. The dental cleaning device as described in claim 1, characterized in that, It also includes a reservoir, to which the liquid pump is connected. The reservoir is used to store the liquid, and the liquid pump is used to draw the liquid stored in the reservoir and deliver it to the nozzle assembly.

6. The dental cleaning device as described in claim 2, characterized in that, The powder storage device includes a second tank and a one-way pressure valve. The second tank stores the dental cleaning powder. The second tank is provided with a second air inlet connected to the second air passage. The one-way pressure valve is provided at the second air inlet or the second air passage. When the control valve is in the first state... The The pressure-stabilizing gas storage device delivers the stabilized high-pressure gas flow to the second connecting gas flow via the first connecting gas flow. The pressure check valve can automatically open after the gas pressure reaches a certain value, so that the stabilized high-pressure gas flow enters the second tank through the second air inlet.

7. The dental cleaning device as described in claim 6, characterized in that, The dental cleaning powder is one or more of sodium bicarbonate, glycine, and erythritol; and / or, the one-way pressure valve automatically closes when the pressure drops below a certain value.

8. The dental cleaning device as described in claim 7, characterized in that, The second air inlet is located at the bottom of the second can, and the bottom of the second can is inclined toward the second air inlet so that the dental powder gathers toward the second air inlet under the action of gravity.

9. The dental cleaning device as described in claim 8, characterized in that, The powder storage device also includes a second air outlet pipe connected to the fifth air passage. The second air outlet pipe is located at the bottom of the second container and extends into the second container. The end of the second air outlet pipe extending into the second container is at least higher than the dental cleaning powder.

10. The dental cleaning device as claimed in claim 1, characterized in that, It also includes a handle, on which the nozzle assembly is disposed.

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