The best age for children to correct malocclusion is: boy 12 ~ 14 years old, girl 1 1 ~ 13 years old. But every child's growth and development are different, so we can't generalize. We should estimate the peak period of growth and development through certain testing methods. The suggestion is to take the child to the hospital for specific examination. It is not appropriate for children to correct their teeth too early or too late.