Generally speaking, 12 years old is the appropriate age for children to do orthodontics, mainly because

① At this time, most of the permanent teeth in the mouth have erupted (but the second permanent molar may be erupting and the third permanent molar has not yet erupted), and the dental arch development has been basically completed, so the uneven tooth development has basically been finalized;

② At this age, children's maxillofacial development is still in a period of rapid growth and development, and orthodontics needs to make use of the growth and development potential of maxillofacial region to make the efficiency of tooth movement and alveolar bone reconstruction reach the best level;

At this time, children's psychological development became more and more mature, and they began to pay attention to their facial beauty. To some extent, he has the motivation to ask for orthodontics. Therefore, children at this stage can basically cooperate with doctors for treatment when correcting. Due to the complexity of the growth and development of oral and maxillofacial region and the occurrence and development of tooth irregularity, the optimal orthodontic age is not an absolute concept. For example, some tooth deformities that seriously affect the normal growth and development of maxillofacial region, such as backbiting and severe tooth crowding, need to be observed or treated before 12 years old.