During their growth and development, everyone’s teeth can have different degrees of growth abnormalities, such as misaligned and misaligned teeth, due to congenital or acquired factors. Incompatible relationship between teeth and craniofacial can seriously affect the appearance and oral safety, including chewing and pronunciation. Therefore, many children will improve their malocclusion through early treatment and early intervention, but many adults will have such doubts: Is there an age limit for orthodontics? Is it necessary for adults to do orthodontics? 1, the golden age of orthodontics In general, children around 6 months when the lower jaw premolar teeth began to erupt (5 months or 1 year before the eruption are within the normal range) until the age of three. The milk molars then gradually come out and establish the occlusal relationship. Children at this stage often have the habit of biting their lips, sucking and biting fingers and other objects, but these are normal physiological needs of children’s development and gradually decrease until they disappear as they grow older. Attention to teeth should begin in early childhood, and it is important for parents to correct the above behaviors in children during this stage as a way to reduce their impact on teeth. The American Orthodontic Association has suggested that the first orthodontic examination should preferably take place before the age of seven. However, due to the development of modern life and changing habits, it is generally recommended that children undergo an orthodontic examination at the age of 3-3.5 years. Therefore, the most appropriate time for orthodontics should be before the bones have fully grown together, that is, the adolescent period. 2, which adults are suitable for orthodontics? Among the adults who have orthodontic treatment, one group wants to improve the functional impairment caused by malocclusion; the other group wants to become beautiful through orthodontic treatment. At present, our adult population, there are still a large proportion of people who need orthodontic treatment have not yet received orthodontic treatment. Regarding whether adults can be orthodontic, there are two opposing views on the Internet: one says that they can receive treatment; the other believes that the skeletal muscles have fully grown and the treatment will be less effective, and even the side effects will be more obvious. From a professional point of view, bone cells are active throughout their lives, and the alveolar bone has the potential to be altered at any age, so there is no problem for adults to do orthodontics. 3, orthodontics will appear after the braces face? Some people think that orthodontics causes braces face, or that braces face is the sequelae of orthodontics. In fact, orthodontics is not the direct cause of braces face, the root cause is that after orthodontics teeth are sore and weak, so you can only eat less, eat slowly, many people even do not eat because of this, and finally fat thinning, atrophy of the temporal muscle of the bite muscle, resulting in the protrusion of the cheekbone and temple sunken, thus appearing braces face. Therefore, orthodontics and brace face are not causally related, and many patients, can regain their cheek fullness after resuming their diet or ending their orthodontic treatment. Therefore, adults can receive orthodontic treatment, but they need to work closely with their doctors during the process to avoid bad situations as much as possible.