Tooth laser whitening device and method

Abstract

The invention discloses a tooth laser whitening device and method. The device comprises a laser, a half-wave plate, a polaroid, a reflector group, a frequency doubling crystal, a dichroscope and a focusing lens, the laser emits one-micron laser to the half-wave plate, and the polarization state of the one-micron laser is adjusted by the half-wave plate and then reaches the polaroid. The polaroid is used for transmitting or reflecting a micron laser according to the polarization state of the micron laser; wherein the polarizer transmits a micron laser, the micron laser is converted into a green laser through the frequency doubling crystal, and after the green laser is reflected by the dichroscope, the green laser is focused and emitted by the focusing lens; or, the polarizer reflects one-micron laser, and the laser is focused by the focusing lens after being reflected by the reflector group and transmitted by the dichroscope. According to the technical scheme provided by the invention, the melanin in the enamel can be burnt by utilizing the strong absorption characteristic of the melanin to green laser and one-micron laser so as to realize tooth whitening, and the damage to the teeth is greatly reduced.

Description

Technical Field

[0001] The present application relates to the field of oral care technology, and in particular to a tooth laser whitening device and method. Background Art

[0002] As people's requirements for oral health and beauty continue to increase, teeth whitening technology has received increasing attention.

[0003] At present, there are mainly the following existing technical solutions in the field of teeth whitening. One is grinding and polishing after scaling, which first uses professional dental instruments to scale the tooth surface to remove tartar, plaque, etc., and whitens it with bleaching agents, such as whitening toothpaste, tooth stickers, gels, etc. The bleaching agent can decompose the pigment on the tooth surface to whiten the teeth, and then use grinding tools to polish the tooth surface to make the tooth surface smoother. In addition, for the case of darker teeth or defects, crowns or veneers are used. However, these existing technologies have obvious defects. Grinding and polishing after scaling will cause certain damage to the tooth surface, and bleaching agents will cause certain stimulation to the teeth, which may cause tooth sensitivity and pain, and the whitening effect is limited. It is impossible to remove deep pigment deposition, and regular maintenance is required, otherwise stains and pigments will easily appear again. The treatment process of crowns or veneers is complicated and requires multiple visits. The high cost increases the economic burden of patients, and it also causes certain damage to the teeth, and some tooth tissues need to be ground off. Summary of the invention

[0004] The present application provides a tooth laser whitening device and method, aiming to solve the problem of certain damage during tooth whitening in the prior art.

[0005] To achieve the above-mentioned purpose, the present application proposes a tooth laser whitening device. The device includes a laser, a half-wave plate, a polarizer, a reflector group, a frequency doubling crystal, a dichroic mirror and a focusing lens;

[0006] The laser emits a one-micron laser beam incident on the half-wave plate, and the one-micron laser beam is incident on the polarization plate after the half-wave plate adjusts the polarization state of the one-micron laser beam. The polarization plate is used to transmit or reflect the one-micron laser beam according to the polarization state of the one-micron laser beam.

[0007] The polarizer transmits the one-micron laser, which is converted into green laser by the frequency doubling crystal and reflected by the dichroic mirror before being focused and emitted by the focusing lens; or the polarizer reflects the one-micron laser, which is reflected by the reflector group and transmitted by the dichroic mirror before being focused and emitted by the focusing lens.

[0008] In some embodiments, the laser is a neodymium-doped nanosecond laser, a neodymium-doped picosecond laser, an ytterbium-doped picosecond laser, or an ytterbium-doped femtosecond laser.

[0009] In some embodiments, the reflector group includes at least two reflectors, and the two reflectors are used to reflect the one-micron laser reflected by the polarizer to the dichroic mirror.

[0010] In some embodiments, the frequency doubling crystal is a barium metaborate crystal or a potassium titanyl phosphate crystal.

[0011] The present application also provides a tooth laser whitening method, using the tooth laser whitening device as described above, the tooth laser whitening method comprises:

[0012] Determine the type of laser to use for laser whitening of the patient's teeth;

[0013] The half-wave plate in the device is adjusted according to the laser type to adjust the polarization state of the one-micron laser emitted by the laser, so as to output the required whitening laser in the device to act on the patient's teeth.

[0014] In some embodiments, determining the type of laser to be used for laser whitening of the patient's teeth comprises:

[0015] Obtain the dental health status of the patient's oral cavity to determine the patient's teeth whitening needs;

[0016] The type of laser for laser whitening of the patient's teeth is determined based on the whitening requirements.

[0017] In some embodiments, obtaining the dental health status of the patient's oral cavity to determine the patient's teeth whitening needs includes:

[0018] Obtain the melanin deposition on the teeth in the patient's mouth;

[0019] The analysis shows that the melanin deposition is tooth surface deposition or tooth deep deposition;

[0020] If it is deposited on the surface of the teeth, then the patient's teeth whitening needs are judged to be shallow whitening, otherwise it is deep whitening.

[0021] In some embodiments, determining the laser type for laser whitening of the patient's teeth according to the whitening requirement includes:

[0022] When the whitening requirement is for shallow whitening, determining that the laser type used for laser whitening of the patient's teeth is a green laser, so as to perform teeth whitening treatment by using the green laser; or,

[0023] When the teeth whitening requirement is deep whitening, the laser type used for laser whitening of the patient's teeth is determined to be a one-micron laser, so that the teeth whitening treatment is performed using the one-micron laser.

[0024] In some embodiments, adjusting the polarization state of the one-micron laser emitted by the laser by adjusting the half-wave plate in the device according to the laser type comprises:

[0025] When the laser type used for laser whitening of the patient's teeth is a green laser, adjusting the half-wave plate so that the polarization state of the one-micron laser is horizontal polarization; or,

[0026] When the laser type used for laser whitening of the patient's teeth is a one-micron laser, the half-wave plate is adjusted so that the polarization state of the one-micron laser is vertical polarization.

[0027] In some embodiments, the step of outputting the desired whitening laser in the device to act on the patient's teeth comprises:

[0028] The one-micron horizontally polarized laser is transmitted through the polarizer, converted into green laser by the frequency doubling crystal, reflected by the dichroic mirror, and then focused by the focusing lens to act on the patient's teeth; or,

[0029] The one-micron laser with vertical polarization is reflected by the polarizer, reflected by the reflector group and transmitted by the dichroic mirror, and then focused by the focusing lens to act on the patient's teeth.

[0030] The technical solution of the present application proposes a tooth laser whitening device and method. The device includes a laser, a half-wave plate, a polarizer, a reflector group, a frequency doubling crystal, a dichroic mirror and a focusing lens; the laser emits a one-micron laser incident on the half-wave plate, and the polarization state of the one-micron laser is adjusted by the half-wave plate and then reaches the polarizer; the polarizer is used to transmit or reflect the one-micron laser according to the polarization state of the one-micron laser; wherein the polarizer transmits the one-micron laser, which is converted into a green laser by the frequency doubling crystal and the green laser is reflected by the dichroic mirror, and then is focused and emitted by the focusing lens; or, the polarizer reflects the one-micron laser, which is reflected by the reflector group and transmitted by the dichroic mirror, and then is focused and emitted by the focusing lens. The tooth laser whitening device provided by the technical solution of the present application can emit a one-micron laser and a green laser by adjusting the half-wave plate, and then use the strong absorption characteristics of melanin to the green laser and the one-micron laser to burn the melanin in the enamel to achieve tooth whitening, so as to greatly reduce the damage to the teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0032] Figure 1 This is a schematic diagram of the structure of a tooth laser whitening device according to an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the process of a tooth laser whitening method according to an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a process for determining the type of laser to be used for laser whitening of a patient's teeth according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0038] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their 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 at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] See also Figure 1As shown, the present application proposes a tooth laser whitening device. The device includes a laser 1, a half-wave plate 3, a polarizer 4, a reflector group, a frequency doubling crystal 5, a dichroic mirror 9 and a focusing lens 10; the laser 1 emits a one-micron laser 2 incident on the half-wave plate 3, and the polarization state of the one-micron laser 2 is adjusted by the half-wave plate 3 and then reaches the polarizer 4; the polarizer 4 is used to transmit or reflect the one-micron laser 2 according to the polarization state of the one-micron laser 2; wherein the polarizer 4 transmits the one-micron laser 2, which is converted into a green laser 6 by the frequency doubling crystal 5 and the green laser 6 is reflected by the dichroic mirror 9 and then focused and emitted by the focusing lens 10; or, the polarizer 4 reflects the one-micron laser 2, which is reflected by the reflector group and transmitted by the dichroic mirror 9 and then focused and emitted by the focusing lens 10.

[0040] The tooth laser whitening device proposed in the technical solution of the present application is intended to output a one-micron laser 2 or a green laser 6 to act on the patient's teeth to achieve tooth whitening through laser action.

[0041] In a specific setting, a laser 1 is used to emit a one-micron laser 2, and an optical switch effect is achieved through the cooperation of a half-wave plate 3 and a polarizer 4, so that the one-micron laser 2 transmits or reflects the laser on the polarizer 4. It can be understood that the half-wave plate 3 can change the polarization direction of the light, and the polarizer 4 can selectively transmit light of a specific polarization direction. When the half-wave plate 3 rotates the polarization direction of the incident laser by 90° (for example, from horizontal polarization to vertical polarization), if the polarizer 4 is set to allow only horizontally polarized light to pass through, the light originally passing through the polarizer 4 will be blocked and reflected, thereby achieving an effect similar to an optical switch.

[0042] In this way, after the one-micron laser 2 (wavelength of 1000-1100nm) changes its polarization direction through the half-wave plate 3, it has two optical paths to choose from after passing through the polarizer 4. One of the optical paths is: the one-micron laser 2 is transmitted through the polarizer 4 and enters the frequency doubling crystal 5 for conversion. The frequency doubling crystal 5 can convert the lower frequency light into higher frequency light (with a shorter wavelength), that is, it is converted into a green laser 6 (wavelength of 500-550nm). The green laser 6 can further be emitted to the dichroic mirror 9, and then reflected by the dichroic mirror 9 and focused on the teeth by the focusing lens 10 for teeth whitening; and the other optical path is: after the one-micron laser 2 is reflected by the polarizer 4, it is reflected again by the reflector group to the dichroic mirror 9 for transmission, and finally is also focused on the teeth by the focusing lens 10 for teeth whitening.

[0043] It can be seen that the tooth laser whitening device proposed in this application can realize the conversion of laser types. Among them, in order to adapt to the layout of the laser light path, the half-wave plate 3 in this application is a controllable half-wave plate to adjust the incident light to convert between the horizontal polarization direction and the vertical polarization direction. For example, the regulation of the half-wave plate 3 can be to dynamically adjust the refractive index difference of the half-wave plate 3 through an external control signal, so as to achieve precise control of the polarization direction of the light. And, the dichroic mirror 9 proposed in this application is designed to reflect the green laser 6 and transmit the one-micron laser 2.

[0044] Therefore, the present application realizes precise control and guidance of the one-micron laser 2 and the green laser 6 by setting the above-mentioned optical element structure, so that in actual application of the device, the doctor or operator can selectively use the one-micron laser 2 or the green laser 6 for teeth whitening treatment according to different treatment needs.

[0045] It is understandable that the reason why the technical solution of this application uses one-micron laser 2 and green laser 6 to achieve teeth whitening is that melanin has strong absorption characteristics for green laser 6 and one-micron laser 2. After melanin absorbs light energy, a photothermal effect occurs, that is, light energy is converted into heat energy, causing the temperature of melanin particles to rise, and the internal structure of the particles is damaged, and then they are broken and decomposed. However, tooth enamel hardly absorbs these two lasers. Therefore, these two lasers can effectively reduce the adverse effects on tooth enamel and surrounding tissues such as gums during tooth whitening, making the laser whitening process safer and more reliable.

[0046] Among them, the output laser can be further controlled to be one-micron laser 2 or green laser 6 through the device structure setting, so that the corresponding laser treatment plan can be used according to the specific conditions of the patient's teeth. Including: when the patient's teeth are darker and shallow melanin deposits, green laser 6 can be used for whitening, because melanin has a stronger absorption capacity for green laser 6; and when the patient's teeth are darker melanin deposits, one-micron laser 2 is used for whitening, and one-micron laser 2 has stronger penetration into tooth enamel.

[0047] In summary, the technical solution of the present application can be based on the absorption characteristics of teeth to one-micron laser 2 or green laser 6, which can greatly reduce the damage to teeth while achieving teeth whitening, so as to achieve a treatment effect close to non-destructive whitening.

[0048] In some embodiments, the laser 1 is a neodymium-doped nanosecond laser, a neodymium-doped picosecond laser, an ytterbium-doped picosecond laser, or an ytterbium-doped femtosecond laser.

[0049] In this embodiment, when selecting the laser 1, a laser with a pulse width of nanoseconds or narrower and an energy of hundreds of microjoules or higher is preferred. The above-mentioned laser types can meet the requirements. Among them, if accuracy and resolution are pursued, a picosecond or femtosecond laser is selected; and if energy density is more important, a nanosecond laser is selected.

[0050] In some embodiments, the reflector group includes at least two reflectors, such as a first reflector 7 and a second reflector 8 , and the two reflectors are used to reflect the one-micron laser 2 reflected by the polarizer 4 to the dichroic mirror 9 .

[0051] In this embodiment, the reflector group ensures that the one-micron laser 2 reflected from the polarizer 4 can be guided to the dichroic mirror 9 along the predetermined optical path through precise angle adjustment. The design of the reflector group can optimize the optical path and spatial layout, making the device more compact and efficient.

[0052] In some embodiments, the frequency doubling crystal 5 is a barium metaborate crystal or a potassium titanyl phosphate crystal, both of which are excellent frequency doubling crystal materials and are conducive to manufacturing green laser 6 .

[0053] The present application also provides a method for laser whitening of teeth, using the above laser whitening device, see Figure 2 The process diagram of the tooth laser whitening method shown in FIG. 1 includes:

[0054] Step S10, determining the type of laser used for laser whitening of the patient's teeth.

[0055] In this step, the doctor or operator needs to select the most suitable laser type. It is understandable that the patient's dental condition will affect the effect of laser whitening treatment. Therefore, when determining the laser type, it is necessary to consider the patient's specific situation and choose the laser type that best suits the patient's dental condition. For example, for patients with darker teeth or tooth sensitivity problems, it may be necessary to choose a laser type with lower energy density and lower penetration depth to reduce irritation and damage to the teeth.

[0056] See also Figure 3 The process diagram shown further comprises:

[0057] Step S110, obtaining the health status of the teeth in the patient's mouth to determine the patient's teeth whitening needs.

[0058] This step enables the doctor or operator to accurately assess the patient's teeth whitening needs and develop a whitening plan by examining the health status of the teeth in the patient's mouth.

[0059] Specifically, the doctor or operator first carefully examines the teeth in the patient's mouth to obtain the melanin deposition on the teeth. The inspection method can be through visual inspection, oral endoscope and other tools to clearly observe the pigment deposition on the surface of the teeth. Then, based on the observed melanin deposition, further analyze whether the melanin deposition is surface deposition on the teeth or deep deposition on the teeth; if the melanin deposition is mainly located on the surface of the teeth, it may be due to pigment deposition caused by external factors such as smoking and drinking coffee, and it is judged as a shallow whitening need. If the melanin deposition is deep inside the teeth, it may be due to pigment deposition caused by internal factors such as aging and tetracycline teeth, and it is judged as a deep whitening need.

[0060] Step S120, determining the laser type for laser whitening of the patient's teeth according to the whitening requirements.

[0061] When the teeth whitening requirement is shallow whitening, the laser type used for laser whitening of the patient's teeth is determined to be green laser 6, and then the teeth whitening treatment is performed using green laser 6. The green laser 6 has a lower energy density and better penetration, and can effectively remove pigment deposits on the tooth surface without causing excessive damage to the teeth. Or,

[0062] When the teeth whitening requirement is deep whitening, the laser type used for the patient's teeth laser whitening is determined to be one micron laser 2, and then the teeth whitening treatment is performed using one micron laser 2. One micron laser 2 has a higher energy density and deeper penetration, and can penetrate deep into the teeth to effectively decompose and remove deep pigment deposits.

[0063] Step S20, adjusting the half-wave plate 3 in the device according to the laser type to adjust the polarization state of the one-micron laser 2 emitted by the laser 1, so as to output the required whitening laser in the device to act on the patient's teeth.

[0064] In this step, after determining the type of laser used for teeth whitening of the patient, the teeth laser whitening device is regulated so that the device outputs the corresponding laser to perform the laser whitening operation.

[0065] Among them, adjusting the half-wave plate 3 in the device according to the laser type to adjust the polarization state of the one-micron laser 2 emitted by the laser 1 includes: when the laser type used for laser whitening of the patient's teeth is the green laser 6, adjusting the half-wave plate 3 so that the polarization state of the one-micron laser 2 is horizontal polarization; or, when the laser type used for laser whitening of the patient's teeth is the one-micron laser 2, adjusting the half-wave plate 3 so that the polarization state of the one-micron laser 2 is vertical polarization.

[0066] Furthermore, after adjusting the polarization state of the one-micron laser 2 through the half-wave plate 3, it can be transmitted in different optical paths in cooperation with the subsequent polarizer 4, and further converted into different types of lasers. Specifically, it includes a horizontally polarized one-micron laser path and a vertically polarized one-micron laser path. Among them:

[0067] Path of horizontally polarized one-micron laser: first, the horizontally polarized one-micron laser 2 passes through the polarizer 4. Since the polarizer 4 only allows light with the same polarization direction to pass through, the horizontally polarized one-micron laser 2 transmits the polarizer 4 and continues to propagate; then, the laser passes through the frequency doubling crystal 5. The frequency doubling crystal 5 can shorten the wavelength of the laser by half. The one-micron laser 2 that originally passed through is converted into a green laser 6 with a shorter wavelength after passing through the frequency doubling crystal 5; the green laser 6 is emitted to the dichroic mirror 9. The dichroic mirror 9 is an optical element with high reflectivity for a specific wavelength and high transmittance for other wavelengths. Based on this, the green laser 6 is reflected by the dichroic mirror 9; finally, the reflected green laser 6 is focused into a very small light spot through the focusing lens 10, which is precisely applied to the patient's teeth to achieve a whitening effect.

[0068] Path of vertically polarized one-micron laser: Different from horizontally polarized laser, vertically polarized one-micron laser 2 is reflected when passing through polarizer 4. This is because polarizer 4 only allows light with the same polarization direction to pass through, while vertically polarized light will be reflected. The reflected one-micron laser 2 then passes through a reflector group, which is composed of a plurality of reflectors and is used to change the propagation direction of the laser so that it can propagate along a predetermined path. The one-micron laser 2 reflected by the reflector group is projected onto the dichroic mirror 9, but this time, the dichroic mirror 9 allows it to be transmitted. The transmitted one-micron laser 2 finally passes through the focusing lens 10, and is also focused into a very small light spot and acts on the patient's teeth.

[0069] In summary, the treatment method proposed in this application proposes a technical solution on how to find the type of laser that is suitable for the patient's teeth whitening solution, and optimize the output of the laser through device regulation so that it can accurately act on the patient's teeth. The most suitable laser parameters and paths can be selected according to the patient's specific needs (such as the pigmentation of the teeth), and ultimately the teeth whitening effect can be achieved through laser, while reducing damage to the teeth.

[0070] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A tooth laser whitening device, characterized in that: It includes laser, half-wave plate, polarizer, reflector set, frequency doubling crystal, dichroic mirror and focusing lens; The laser emits a one-micron laser beam incident on the half-wave plate, and the one-micron laser beam is incident on the polarization plate after the half-wave plate adjusts the polarization state of the one-micron laser beam. The polarization plate is used to transmit or reflect the one-micron laser beam according to the polarization state of the one-micron laser beam. The polarizer transmits the one-micron laser, which is converted into green laser by the frequency doubling crystal and reflected by the dichroic mirror before being focused and emitted by the focusing lens; or the polarizer reflects the one-micron laser, which is reflected by the reflector group and transmitted by the dichroic mirror before being focused and emitted by the focusing lens.

2. The tooth laser whitening device according to claim 1, characterized in that: The laser is a neodymium-doped nanosecond laser, a neodymium-doped picosecond laser, an ytterbium-doped picosecond laser or an ytterbium-doped femtosecond laser.

3. The tooth laser whitening device according to claim 1, characterized in that: The reflector group includes at least two reflectors, and the two reflectors are used to reflect the one-micron laser reflected by the polarizer to the dichroic mirror.

4. The tooth laser whitening device according to claim 1, characterized in that: The frequency doubling crystal is a barium metaborate crystal or a potassium titanyl phosphate crystal.

5. A tooth laser whitening method, using the tooth laser whitening device according to any one of claims 1 to 4, the tooth laser whitening method comprising: Determine the type of laser to use for laser whitening of the patient's teeth; The half-wave plate in the device is adjusted according to the laser type to adjust the polarization state of the one-micron laser emitted by the laser, so as to output the required whitening laser in the device to act on the patient's teeth.

6. The tooth laser whitening method according to claim 5, characterized in that: The types of lasers identified for laser whitening of a patient's teeth include: Obtain the dental health status of the patient's oral cavity to determine the patient's teeth whitening needs; The type of laser for laser whitening of the patient's teeth is determined based on the whitening requirements.

7. The tooth laser whitening method according to claim 6, characterized in that: The obtaining of the dental health status in the patient's oral cavity to determine the patient's teeth whitening needs includes: Obtain the melanin deposition on the teeth in the patient's mouth; The analysis shows that the melanin deposition is tooth surface deposition or tooth deep deposition; If it is deposited on the surface of the teeth, then the patient's teeth whitening needs are judged to be shallow whitening, otherwise it is deep whitening.

8. The tooth laser whitening method according to claim 7, characterized in that: The laser type for laser whitening of the patient's teeth according to the whitening requirement includes: When the whitening requirement is for shallow whitening, determining that the laser type used for laser whitening of the patient's teeth is a green laser, so as to perform teeth whitening treatment by using the green laser; or, When the teeth whitening requirement is deep whitening, the laser type used for laser whitening of the patient's teeth is determined to be a one-micron laser, so that the teeth whitening treatment is performed using the one-micron laser.

9. The tooth laser whitening method according to claim 8, characterized in that: The half-wave plate in the control device according to the laser type to adjust the polarization state of the one-micron laser emitted by the laser comprises: When the laser type used for laser whitening of the patient's teeth is a green laser, adjusting the half-wave plate so that the polarization state of the one-micron laser is horizontal polarization; or, When the laser type used for laser whitening of the patient's teeth is a one-micron laser, the half-wave plate is adjusted so that the polarization state of the one-micron laser is vertical polarization.

10. The tooth laser whitening method according to claim 9, characterized in that: The method of outputting the required whitening laser in the device to act on the patient's teeth includes: The one-micron horizontally polarized laser is transmitted through the polarizer, converted into green laser by the frequency doubling crystal, reflected by the dichroic mirror, and then focused by the focusing lens to act on the patient's teeth; or, The one-micron laser with vertical polarization is reflected by the polarizer, reflected by the reflector group and transmitted by the dichroic mirror, and then focused by the focusing lens to act on the patient's teeth.

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