In our clinic, we have encountered many friends who were told by their doctors that they had to have their teeth extracted when they consulted orthodontics. They often have a question: Is orthodontic tooth extraction harmful? The answer is: as long as the extraction is done correctly, it is beneficial and harmless. In fact, why do we need orthodontic extractions? In most cases, it is a measure to reduce the load on the alveolar bone due to crowding and the alveolar bone can not accommodate such a large amount of teeth. If the teeth are crowded, often because it is not easy to clean, and make the relevant teeth easy to decay or periodontitis, and shorten the service life of the teeth. After orthodontic extraction, the teeth are aligned and easy to clean, which not only improves the aesthetics, but also normalizes the function and prolongs the service life of the teeth. On the other hand, orthodontic extraction of most of the bicuspid teeth, this tooth up and down a total of eight, no aesthetic function, and chewing function is far weaker than the molar teeth, orthodontic treatment, if necessary, can be extracted from two to four bicuspid teeth, you can change the aesthetics and does not affect the function. Of course, although the scientific extraction orthodontic treatment is harmless, but our orthodontic extraction is still a very careful process. First, it should be determined that extractions are “necessary”, beneficial, and will result in aesthetic and functional improvements for the patient. Secondly, the decision of which teeth to extract should be based on a thorough analysis of each patient’s situation. In cases that are at the border between extraction and non-extraction, we often try to treat them without extractions first and try not to extract them if we can. We also receive some unscientific program design in the clinic, improper extraction of teeth caused by bad orthodontic cases, such cases are exceptionally difficult to deal with, the patient’s loss is often difficult to return. In short, orthodontic tooth extraction should be cautious, but scientific orthodontic tooth extraction is harmless.