The best time to get your teeth straightened, also known as orthodontic and orthopedic treatment, has different considerations depending on the age group. I. Milk teeth period 3-5 years old. The purpose of orthodontic treatment is mainly to promote the normal development of children’s maxillofacial, this period is mainly aimed at the milk teeth antimaxillary, mandibular protrusion, posterior teeth antimaxillary and other malocclusion that impede the normal development of the maxillofacial, and timely correction of the habits of tongue stretching, lip biting and other habits that affect the normal function of the oral cavity, to prevent the further occurrence of malocclusion. Second, the replacement teeth period from 8 to 12 years old, this period of local dental irregularities, generally do not have to rush to correct, but for lip biting, tongue, front extension of the jaw and other bad habits or facial abnormalities, anterior anti-mandibular teeth, mandibular functional retraction, as well as the relationship between the upper and lower jaw abnormalities, etc., often need to go to the hospital to find an orthodontist to check, to determine whether the dental, functional or osseous malocclusion, in order to clarify the treatment plan. Third, the permanent teeth period. 11 years old to 15 years old. 12 years old around the permanent teeth began to form, at this time once the teeth appeared misalignment, etc., can only be corrected by orthodontic methods.