Orthodontics is a very mature technology in modern times and belongs to a branch of dentistry. Through the correction of malocclusion, the aesthetics and coordination of teeth, jaws and face are restored, enabling patients to smile with confidence. At the same time, a harmonious relationship between teeth, jaws and face is the basis of oral health, and many patients suffering from periodontal disease or TMJ disease have been restored to health through successful orthodontic treatment. There is no age limit for orthodontic treatment. Depending on the patient’s specific situation, orthodontic treatment can be performed from a few years old to 70 or 80 years old.