With the increasing attention to image beauty, orthodontics has become very popular. However, many children or their families do not understand the need to extract teeth for orthodontics, worrying that the extraction will affect chewing or cause loosening of other teeth, so that the best age for orthodontics is missed due to reluctance to extract teeth. There are usually two reasons why orthodontics requires tooth extraction: one is to provide enough space for the teeth to align crowded teeth by extracting them. Generally, in mild crowding, limited clearance can be obtained by enlarging the dental arch; in moderate to severe crowding, most teeth must be extracted to obtain adequate clearance. The other is to use the space provided by extractions to recover a significantly protruding anterior row of teeth and improve the mid-facial protuberance. Therefore, in cases of anterior protrusion without sufficient space in the arch, orthodontic success must be achieved by extraction. At present, nearly 50% of the cases requiring tooth extraction for orthodontic treatment are clinically significant, not only to obtain more desirable orthodontic results, but also to significantly reduce the recurrence rate after orthodontic treatment. From the orthodontic history of nearly 100 years abroad and decades in China, extraction orthodontics generally has no significant damage to the health of the teeth. In the orthodontic design, the orthodontist prefers to extract the diseased teeth and the teeth that have the least impact on the chewing function, usually one tooth is extracted symmetrically from the upper and lower left and right, which does not cause a decrease in chewing power. On the contrary, an orthodontically aligned and stable bite is more efficient in chewing. Therefore, orthodontic extraction that facilitates both aesthetic and functional improvement is beneficial but not harmful.