Generally speaking, as long as the periodontal condition at the age of 37 allows, orthodontic treatment is possible. There is no age limit for orthodontic treatment, as long as the periodontal condition of the adult teeth allows, it is completely acceptable for orthodontic treatment, mainly through various orthodontic devices to adjust the coordination between the teeth occlusion and maxillofacial muscles, and ultimately to achieve the balance of the oral and maxillofacial system, stability and aesthetics. Compared to children, adults undergoing comprehensive orthodontic treatment will have more limitations, such as a combination of surgical procedures to correct a bad bite caused by upper and lower jaw dysplasia. Although healthy teeth can be moved at any age, adults have a slower metabolism and a more complex oral environment, making orthodontic treatment more difficult and time-consuming.