Tetracycline teeth is because when the teeth are developing, enamel and dentin start to form at the same time on both sides of a basement membrane, and if tetracycline drugs are taken at this time, the drugs enter the body and form a yellow layer in the dentin and enamel, and the deposition in the dentin is four times higher than in the enamel. The yellow layer is wavy and cap-like, roughly in line with the shape of the tooth. Therefore, the entire tooth has a color change. Initially, the teeth are yellow and show bright yellow fluorescence under sunlight, and then gradually turn from yellow to brown or dark gray, this color change is slow, and sunlight has a facilitating effect on it. In addition, tetracyclines can not only affect the color of permanent teeth that develop during infancy, but also affect the color of milk teeth that develop during fetal life through the placenta if pregnant women take these drugs. We all know that tetracycline teeth are formed by the use of tetracycline drugs. People who work in certain special jobs (e.g. service industry, hosts, actors, celebrities) need to treat tetracycline teeth due to their gray or yellow color, or tetracycline teeth with underdeveloped enamel, which seriously affects the appearance of teeth and other problems. Treatment of tetracycline teeth classic four techniques: 1, visible composite resin restoration method The method will be part of the lip side enamel grinding, with visible composite resin cover the tooth surface to cover the discolored teeth. The advantage of this method is that only a small amount of tooth tissue needs to be removed, less damage to the tooth, and the effect of changing the tooth color can be achieved in a short period of time. In addition, if the covering layer is partially removed or the color changes after a period of time, it can be restored again at a relatively low cost. But the resin can choose less color, and shade effect can not be satisfactory, and the tooth bonding strength is also limited, so the front teeth restored by this method can not withstand large or lasting bite force, so gnawing bones, biting apples and other actions should be avoided as far as possible. 2, porcelain veneer restoration method The method is similar to the visible composite resin restoration method, is also to grind away part of the tooth tissue on the side of the lip, the use of porcelain veneer to cover the tooth body. The method of color shading effect is very good, the patient can choose a wide range of colors, and the bonding strength between the teeth is very high. 3, porcelain full crown restoration method Compared with the above two methods, this method requires uniform grinding of the entire surface layer of the tooth (about 1 mm), after the preparation of the tooth is like a miniature version of the normal tooth, and then use porcelain full crown to restore the shape of the tooth, to change the color of the tooth. The advantages of this method are similar to the porcelain veneer restoration method, but its retention effect is better, and in the restoration at the same time also corrected some of the tooth itself deformities, such as crowns too small, too large a gap, etc., of course, it also has and porcelain veneer similar disadvantages. 4, tooth decolorization method that people often say that the teeth bleaching. Its main principle is to use some drugs to reduce the degree of calcification of tooth enamel, reduce its transparency, so that the teeth are white discoloration to achieve the effect of shading. The advantage is that there is no permanent trauma to the teeth and the patient can control the change of tooth color to some extent. The disadvantage is that the decolorization method requires high requirements for the patient’s teeth, the teeth must be relatively neatly arranged, the enamel on the surface of the teeth must be intact, and the whole treatment period is long, with time, the enamel may also remineralize, the transparency will increase, and the tooth color will recover, so regular consolidation treatment is needed. For patients who have suffered from tetracycline teeth, they can choose to go to our hospital for consultation and treatment, and ask the doctor to make a comprehensive assessment of their dental situation, bite relationship, bite position, bite force, bite habit and psychological tolerance, the impact on work life, whether it will affect speech or pronunciation, and choose a suitable treatment method for themselves. After the treatment, the color of the patient’s teeth can often be significantly improved, or even close to normal.