In terms of orthodontic age, it is better to correct teeth around 12 years old. This is because at this time, the whole dental arch is basically developed, the deciduous teeth are basically replaced by permanent teeth, the roots of permanent teeth are basically developed, and the occlusal relationship between upper and lower teeth is also adjusted. 12 years old is just adolescence, and the child's maxillofacial region is still in a period of rapid growth and development. Orthodontics also needs to make use of the potential of maxillofacial growth and development to ensure that the efficiency of tooth movement and alveolar bone reconstruction reaches the best state, so as to achieve perfect orthodontic effect.

The age of orthodontics is also gender-specific. Generally speaking, girls aged 10- 12 are the best, while boys aged 1 1- 13 are the best. However, some dentofacial deformities, such as "covering the sky" and biting the lips, need to be treated at the age of 3-5; Some dentofacial deformities should be carried out when permanent teeth have begun to erupt, that is, when they are 8- 10 years old.