Tooth staining and discoloration seriously affect the beauty of the face, usually seen in tooth staining and discoloration are fluorosis and tetracycline teeth, etc., must be restored through cosmetic methods, commonly used cosmetic dental methods are the following. Decolorization bleaching is the application of oxidizing agents or acid etching agents to eliminate the staining and discoloration layer of teeth, so as to achieve the purpose of bleaching teeth, but bleaching is not effective for everyone, the specialist should strictly select the indications, the operation should protect the oral mucosa to prevent the gums from being burned. Decolorization bleaching can be divided into two types of bleaching: external bleaching and internal bleaching. External bleaching is mainly used for the decoloration of moderate non-defective fluorosis and tetracycline teeth. There are two methods: oxidation method, the most commonly used drug is hydrogen peroxide with a concentration of 30%, when using it, an appropriate amount of ether can be added to promote the penetration of the drug, and the oxidation effect can also be enhanced by infrared light, laser, heating, etc. Because of the above strong oxidizing agent has a certain degree of corrosiveness, the late 80’s and began to apply the peroxide urea bleaching. Urea peroxide can release ecological oxygen after combining with tissues, which is non-toxic and stimulating to the organism. Therefore, under the guidance of the doctor, the patient can bring a plastic dental tray treatment device every night and squeeze the drug into the tray beforehand, and the treatment can achieve satisfactory results in 3-5 weeks. Acid etching method, with a concentration of 18% to 36% of hydrochloric acid coated on the surface of colored teeth, so that the surface layer of enamel decalcification dissolved to remove the pigment, and then use 10% of calcium gluconate mineralization solution to remineralize the teeth. It is also possible to use the method of abrasion plus acid-etching bleaching, i.e., first abrade the pigment of the surface layer of the colored teeth 0.1-0.2 mm thick, and then acid-etch to further remove the colored layer and remineralize. Internal bleaching: Mainly used for the restoration of discolored anterior teeth, unpulpable teeth or severely tetracycline discolored teeth, the bleaching drug is still 30% hydrogen peroxide. The method is to do the conventional root canal treatment first, and the root canal filling should be 2 to 3 mm below the root canal opening, with a good pad of base material to prevent the drug from penetrating out of the apical foramen. Then a small cotton ball dipped in 30% hydrogen peroxide drug is placed in the pulp cavity, and zinc oxide clove oil mucilage powder is tightly closed, and the drug is changed once in 2-3 days, and good results can be received in 4-7 times. Composite resin coating restoration is a technology that has been gradually developed since the 1980s. It is a polymer composite resin bonded to the surface of the affected tooth to cover the discolored tooth or to repair the defect. Because the composite resin has a natural tooth color and is soft and easily shaped, it can be sculpted repeatedly until the anatomical shape of the tooth is restored. After composite resin coating restoration, the restoration may become brittle, discolored or fall off due to many factors such as temperature and operation, so it should be carefully protected to prolong the service life. The restoration should be protected with care to prolong the life of the restoration. The restoration should be protected by consuming less tea, coffee and other foods that can easily stain the restoration. Veneer is a kind of restoration by pasting the finished veneer (resin veneer, porcelain veneer, cast ceramic veneer, and new plastic hard resin veneer) onto the stained and discolored teeth or defective teeth, which has the advantages of high hardness, anti-wear, beautiful appearance, good finish, no discoloration, and long service life. When the number of teeth to be restored is large, it is often necessary to take a hard mold, select the mold and trim the shape on the turned plaster model, try to fit the teeth, and then transplant and bond the finished tooth to the patient’s affected tooth after the edge of the tooth fits the plaster model. The bonding methods are generally self-consolidating plastic method, EB composite resin bonding method, enamel adhesive bonding method, light-curing composite resin bonding method, etc. The disadvantage of dental veneer restoration is that it is relatively complicated to operate and prone to fall off due to poor bonding.