The process of orthodontics is about six months to about three years. When malocclusion such as antimandibular deformity occurs in the milk teeth, movable aligners can be worn to induce the anterior teeth to move labially and lift the antimandibular, and with the use of extra-oral arch to promote the growth of the maxilla and inhibit the overdevelopment of the mandible, which is completed in about six months. When the permanent teeth are treated with a full dose of orthodontic treatment, the force of the fixed aligners is relatively stable and can generally be completed in 1-2 years. Invisible orthodontic treatment has a softer force and is able to achieve the corrective goal in 2-3 years. adults over 30 years of age take relatively longer to correct than adolescents aged 11-14 years, and patients who undergo integrated surgical procedures generally require about 3 years to end treatment.