With the increasing awareness of dental care, adult orthodontics has become a trend. Adults have missed the best age for orthodontics for various reasons, but now as long as the teeth are healthy and there is no serious periodontal disease adults can do orthodontics. (1) the age of adult orthodontics: dental health, no serious periodontal disease of adults under forty years old can generally do orthodontics. Before the orthodontic treatment, we must first do a dental checkup to make sure that there are no other dental problems before proceeding. (2) The time of adult orthodontics: The time of adult orthodontics also depends on the degree of malocclusion, generally it takes 2 years to 2.5 years. Adult orthodontics also need to cooperate with the doctor to ensure its orthodontic effect. (3) The cost of adult orthodontics is higher than that of children, which is also based on the degree of difficulty, and adult orthodontics can also choose ceramic brackets, which do not affect the aesthetics. Suggestions: adult orthodontics also need to do as early as possible, do not repeatedly miss the age of orthodontics. Because with the age of children, as the gums recede, the crowding and protrusion of teeth will slowly aggravate.