38 years old is able to straighten teeth, orthodontics is no strict age limit, adult orthodontic treatment is completed to wear the aligner according to the doctor’s instructions. 1. 38 years old can be corrected, orthodontics is mainly for children, adults, malocclusion, including malocclusion and oral and maxillofacial bone deformities, adolescent or adult dental health, can be corrected according to the patient’s needs. By improving and restoring oral and maxillofacial aesthetics as well as chewing function, it can improve the quality of life and so on. 2. The orthodontic treatment for adults is still a little bit different from that for teenagers and children. Since the development of adults is completed and the growth potential stops, the relative orthodontic treatment time is also a little bit longer. As long as the orthodontic appliances and retainers are worn according to the doctor’s instructions, the same effect of orthodontic treatment at the optimal age can be achieved. During the orthodontic treatment, good dental care and hygiene are needed, and it is also important to keep the aligners clean and hygienic.