Wearing braces is becoming more and more popular, and all the celebrities you are familiar with have basically worn braces, Hu Ge, Yang Mi, Angelababy and others have transformed smoothly into handsome and beautiful people through orthodontic treatment. However, you may not know that before wearing braces you may need to go through the process of tooth extraction to provide the conditions for smooth orthodontic treatment. At this time, many patients or parents will clearly oppose, thinking that tooth extraction will damage the nerves and make people dumb; that tooth extraction is bad for the body and affects growth and development; that existence is reasonable and tooth extraction is against science, etc. These are some misinformed theories that are spread by blackmail. Therefore, it is necessary to popularize: tooth extraction in braces is a normal phenomenon, and often 4 to 8 teeth will be extracted, otherwise, it may lead to orthodontic treatment can not be carried out, or lead to orthodontic treatment failure. The number and role of teeth. The number of teeth a normal person has is 32 in total, including four wisdom teeth, on the upper and lower left and right. There are four incisors, two cuspids (tigers), four premolars, and six molars (big teeth) in each of the upper and lower teeth. The incisors are used to cut food, the cusps are used to support the corners of the mouth, and the molars are used to chew food; and the premolars are in the middle of the tooth row, playing a transitional role and playing little role in exercising oral functions. Therefore, in wearing braces, orthodontists often choose to extract the premolar teeth. The relationship between teeth and bone. To design an orthodontic plan, it is not only a matter of analyzing the teeth, but more importantly, the relationship between the teeth and the bone. During the evolutionary process, from primitive humans to modern humans, food has changed from raw to cooked, from coarse to fine, from hard to soft, and the chewing organs have been increasingly stimulated and weakened, resulting in the gradual degradation and reduction of the chewing organs. In this process, the degeneration and shrinkage of the masticatory organs are not balanced, that is, the muscles are first, the jawbone is second, and the teeth are second. This degeneration imbalance makes the jawbone unable to accommodate 32 teeth, and the amount of teeth and bone is not adjusted, leading to the occurrence of wisdom teeth obstruction and uneven teeth crowding, which in turn affects the normal bite function, jawbone development and facial aesthetics. The role of tooth extraction in wearing braces. 1. To solve the crowding of teeth. Tooth extraction is required to provide clearance to coordinate the amount of teeth with the amount of bone through orthodontic treatment. Usually, four relatively weak premolar teeth are reduced, and one is extracted from the upper and lower left and right, and the space gained is used to align the other teeth. After the orthodontic treatment is finished, the extraction gap is completely closed. 2. Improve the facial protrusion. Because of the protruding facial shape of yellow people, especially in Guangdong, and the aesthetic standard of the general public is the straight face of Europeans, many adults come to orthodontics to improve the “protruding mouth”. In this case, it is necessary to provide a gap by extracting teeth, so that the front teeth can be recovered as much as possible to make the facial shape straight and harmonious.3. Remove some teeth that affect the jawbone development, so as to guide the normal development of the jawbone and obtain a harmonious facial appearance.4. Prevent relapse. In order to prevent topping out the teeth in the normal dentition, or to prevent the recurrence of tooth irregularities, it is recommended to extract the wisdom teeth as early as possible. Is there any harm to the teeth by tooth extraction. In orthodontics, tooth extraction is usually harmless, not to mention nerve damage. The treatment plan developed by a professional orthodontist, extraction of teeth to bring about functional, health and aesthetic improvement is far greater than the so-called “injury”. Modern dentistry has been developed for a hundred years, and it has not been reported that tooth extraction can cause harm to other parts of the body, so it is possible to eliminate unnecessary fears in orthodontics. Of course, extraction orthodontics is a very careful process, and the patient’s decision to reduce the number of teeth should be made by a professionally trained orthodontist after analyzing various factors.