Orthodontic tooth extraction is mainly due to two aspects: First, the crowded teeth, tooth extraction for decongestion Due to human degeneration, the modern jawbone has become increasingly unable to accommodate the growing teeth, which is the root cause of dental crowding. Secondly, with the improvement of living standard, the food becomes more and more fine, the jaw bone lacks the stimulation of chewing, and the development is insufficient, which will aggravate the crowded teeth. In addition, the current domestic dental care measures can not keep up, the incidence of dental caries (tooth decay) in children is very high, which leads to early loss of milk teeth, early eruption of permanent teeth, also become the cause of dental crowding. Second, bony problems, tooth extraction to compensate. For example, maxillary protrusion, the upper jaw is inwardly retracted by tooth extraction to disguise bony malocclusion. Despite the reluctance of doctors and patients to extract teeth, the ratio of orthodontic patients to extract teeth in China is still quite high at present. Orthodontic extraction treatment is a very prudent decision that must be based on an accurate diagnosis and a sound treatment plan. Otherwise, improper extraction treatment can lead to serious consequences. Of course, if teeth are not extracted when they should be, the treatment will not be effective and will be prone to recurrence. In fact, orthodontic tooth extraction is performed under local anesthesia, which is not painful and takes only a few minutes for most people. There is no great discomfort after waking up from the anesthetic. Therefore, patients can rest assured.