Although our teeth are all white at birth, in the process of growth and development, we will constantly encounter various factors that destroy the neatness and beauty of teeth, such as tooth deformity, tetracycline teeth, tooth decay, tooth trauma, food pigment and so on. In the end, there are not many people who can really have natural perfect teeth to live for a lifetime. Making all-ceramic teeth needs to remove some tooth tissue, and some beauty lovers will be a little scared for this; In fact, the doctor only grinds off the uneven and scarred enamel, not the dentin, so it won't hurt the teeth. Instead, wear a sturdy "bulletproof vest" to protect teeth from external bacteria, which not only restores the beauty of teeth, but also does not affect the original chewing function. All-ceramic teeth should pay attention to the coordination of tooth color and skin color, and the shape of teeth should be coordinated with the size of five senses. All these need professional and experienced institutions to complete, and you can't go to roadside clinics just because you are greedy for cheap, otherwise it may bring more trouble. Of course, all-ceramic teeth, like ordinary teeth, need certain maintenance and care, brush your teeth frequently, treat periodontal disease in time and prevent gingival atrophy. As long as you do this, good teeth will not be a problem all your life. There are two main reasons for tooth discoloration: yellow or black teeth. Wu Guoxing, director of cosmetic dentistry at Hangzhou Huashan Medical Beauty Hospital, said that according to professional terms, there are two factors: endogenous and exogenous. Exogenous coloring. There are many kinds of bacteria on the tooth surface, which secrete a lot of sticky substances. Food residues, coffee, red wine, tea stains and tobacco stains in daily diet are all adsorbed on these sticky substances, and teeth will turn yellow or black after a long time. Endogenous coloring. The formation during tooth development, such as tetracycline deposition, will make the teeth turn yellow, brown or dark gray, which is called tetracycline teeth. Excessive fluoride in drinking water will lead to dental fluorosis, and white chalk and brown plaque will appear on the surface of teeth. If the tooth nerve is necrotic, the combination of bacterial decomposition products will also make the tooth black. If the teeth are black or yellow, you need dental beauty. If there are obvious stains on the surface of teeth, or if smoking and drinking tea make teeth yellow, then the whitening effect of simple brushing is not ideal. Director Wu said that whitening toothpaste is mainly caused by the friction between the friction agent and the stain on the tooth surface when brushing teeth, and the effect is limited. Why do teeth turn yellow? Plastic surgeons in Ningbo said that there are many reasons for tooth discoloration and yellowing, which are mainly divided into two aspects, namely endogenous and exogenous. Exogenous coloring. There are many kinds of bacteria on the tooth surface, which secrete a lot of sticky substances. Food residues, coffee, red wine, tea stains, tobacco stains, etc. in the daily diet are adsorbed on these sticky substances, which gradually turn the teeth yellow or black. Endogenous coloring. It is formed in the process of tooth development, such as tetracycline deposition, which will turn teeth into yellow, brown or dark gray, called tetracycline teeth; If drinking water contains too much fluorine, it will lead to dental fluorosis, and white chalk and brown plaque will appear on the tooth surface; If tooth nerve necrosis is combined with bacterial decomposition products, it will also make teeth black.