Deciduous period
During this period, malocclusion of deciduous teeth or local teeth should be corrected as soon as possible, and the treatment age is about 3 ~ 6 years old.
Mixed dentition
About 7 ~ 1 1 year, at this time, new permanent teeth begin to erupt, teeth grow rapidly and occlusion is unstable, which is the frequent period of tooth deformity. Using movable or fixed appliances to correct dentition in different degrees, from light to heavy, even has external plastic force.
Permanent tooth stage
During this period, all deciduous teeth have been replaced, and when the second big tooth and the third big tooth erupt, it is another rapid growth period, 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.