Orthodontic treatment can be performed at the age of 22. Generally, the best time for orthodontics is about 12 years old. The alveolar bone grows vigorously and has strong healing ability. Orthodontic treatment has a good effect and a short time. However, if you miss the best period, you can also have orthodontic treatment at a young age. Orthodontic treatment in the twenties has certain limitations, which can only correct teeth, that is, irregular and crowded teeth can be improved through treatment. However, it is impossible for dental treatment like 12 years old to promote jaw development. At this time, because the jaw has developed, the deformity caused by jaw dysplasia can not be solved by orthodontics.