Those with “big chin”, “small chin”, partial jaw, open bite, impacted teeth, premature loss of deciduous teeth, delayed eruption of permanent teeth, serious tooth position abnormalities, etc. should be treated early, and The sooner the better. Orthodontics covers a wide range and usually refers to the treatment process of correcting misaligned teeth and abnormal tooth shapes through oral technical means. Early orthodontic treatment can allow many abnormalities to be fully or partially treated in their initial stages, or at least reduce the likelihood of them getting worse.