First, deciduous period: early correction, the treatment age is about 3 ~ 6 years old, and it can be corrected by wearing oral appliances, and the course of treatment is about 6 months.

Second, mixed dentition: about 7 ~ 1 1 year, deciduous teeth fall off earlier, which leads to the reduction of dental arch length, which in turn leads to the inability to arrange teeth.

Orthodontic appliances adopt movable or fixed appliances, and even cooperate with external plastic force to correct dentition.

Third, the adult permanent tooth period: the best age for orthodontics is generally around 12 ~ 18 years old. At this time, the diagnosis of tooth deformity is relatively clear, and the correction is relatively fast and stable in this rapid growth period.

The above age is relatively suitable for orthodontics, but it does not mean that adults are not suitable for orthodontics. Orthodontic surgery for adults also has certain benefits. For example, adults have a relatively stable personality, can cooperate with doctors well, and postoperative care can also be in place, so the postoperative effect is better.