Children 12 to 14 years old permanent teeth can be corrected teeth. 1. With the improvement of people’s standard of living and the enhancement of the sense of beauty, more and more children with misaligned teeth choose to straighten their teeth, and the appropriate time to straighten their teeth is very important: children aged 3 to 5 years old are in the period of milk teeth, and their teeth are still in the state of adjustment, and most of the deformities are not in need of additional corrections, but the anti-mandibularity can be intervened with orthodontic intervention in this period of time. 2. After the age of 6, the milk teeth start to be gradually replaced by permanent teeth, about 12 years old, all the milk teeth in the mouth are replaced, the position of each tooth, the occlusal relationship between the upper and lower teeth is basically fixed, at this time it is easy for the dentist to judge the type of malocclusion, and then choose the appropriate method of orthodontic treatment, and it is easy to maintain the ideal state after orthodontic treatment is completed, and it will not be easy to return to its original state. It is recommended to consult a professional doctor at the hospital to choose the right time for orthodontic treatment.