Adult teeth can be corrected, but clinically it is best to correct them before the age of 30. Adult orthodontics can only correct irregular tooth arrangement and move teeth, but can't solve the problem of jaw deformity.

If the child's jaw is underdeveloped or overdeveloped, orthodontic treatment can be used to promote jaw development or inhibit jaw overdevelopment. However, the development of the adult jaw has ended, and the shape or length of the jaw can not be changed through orthodontic treatment, only the dental problem can be solved.

Orthodontics also has a certain influence on teeth in adulthood, because the ability of alveolar bone repair is weakened in adulthood, and the recovery of moving teeth is slow, and the effect is not as good as that in childhood.