Orthodontics generally has no definite age limit, and patients in their 50s can have their teeth straightened, but the choice needs to be based on the health of their teeth, and orthodontics is not recommended if the teeth are loose, have periodontitis, or if the roots of the teeth are too short. Orthodontics is generally a treatment for causes such as crowding of the teeth due to a mismatch between the amount of teeth and the amount of bone. Uneven teeth can affect overall aesthetics and may have an impact on normal chewing function. Because the teeth are not aligned and therefore can lead to incomplete brushing, resulting in the bristles can not be cleaned to every part of the teeth, ultimately leading to the deposition of dental calculus, which in turn leads to periodontitis teeth loose, so the teeth are not aligned should be corrected in a timely manner. In summary, more than 50 years old, as long as there is no loose teeth, serious periodontitis and other contraindications, generally can be corrected by wearing braces.