Some orthodontists believe that since teeth are born to parents, they should not be changed. Tooth extraction will damage the musculoskeletal structure, lead to the loosening of the whole mouth, the decline of oral function, and ultimately damage the overall health. Is that really the case? In fact, modern orthodontics has experienced more than a century of technical development and clinical practice, which fully verified the feasibility of tooth extraction in orthodontics and its important role in improving orthodontic efficacy. Orthodontists have used tooth extraction as a routine method to correct some patients with severe dentition disorder. Through the regular treatment of professional doctors, the gap on the gums can be completely closed after tooth extraction, and there is no saying of re-inserting dentures; However, in some cases where the gums are prominent and the teeth are crowded, the protruding front teeth are retracted by using the extraction gap to improve the patient's dentition and beautiful face shape. After treatment, the tooth arrangement and occlusion of patients with tooth extraction can be stably re-established, which will only be more beneficial to their oral and maxillofacial system. A series of clinical problems caused by tooth extraction are often caused by improper orthodontic design and treatment errors. The relative lag in the registration and certification of orthodontists in China has made a large number of general dentists set foot in the field of orthodontics. Due to the lack of correct extraction standards and professional orthodontic technology, these laymen often pull out patients' teeth at will and close the extraction gap rashly, which leads to the deterioration of tooth arrangement and occlusal relationship after treatment, and even can't bear to witness it. If patients spend a lot of money and time to get such treatment consequences, who can give up? Therefore, tooth extraction itself is not a problem, and the abuse of treatment by laymen should be more worrying for patients and their families. With the emergence of new orthodontic techniques, such as tooth extraction with bone implants or distraction osteogenesis to accommodate the original teeth, the proportion of orthodontic patients who need tooth extraction is gradually decreasing. According to the latest animal experimental results of European scientists, the memory of mice may be affected by tooth extraction. If this is confirmed in humans, orthodontists will be more cautious when deciding whether to extract teeth. Hangzhou Time Plastic Surgery Hospital is one of the earliest medical institutions in China to carry out orthodontics. In the leading position in this field, with a number of patented technologies.