Orthodontic treatment has a long course of treatment, usually one to two years, and also regular follow-ups and active cooperation with the doctor. Therefore, patients should be fully prepared. Before orthodontic treatment, it is necessary to deal with the problems existing in the mouth, such as the treatment of dental caries, teeth cleaning, treatment of periodontal disease and so on. After wearing the orthodontic appliances, patients will have mild pain, soreness and other discomfort, which is normal. Usually 3 to 7 days can adapt. During the period of orthodontic treatment, there are special effects on diet. Pay attention not to eat too hard, too sticky food, the front teeth can not directly gnaw hard things, such as chicken wings, ribs, etc., and, eat slowly, can not be swallowed, in order to prevent damage to the orthodontic appliances. It is very important to maintain good oral hygiene during orthodontic treatment, because the resistance of teeth and periodontal tissues during orthodontic treatment decreases, and poor oral hygiene is easy to suffer from dental caries, gingivitis, etc. Especially the demineralization of teeth around the orthodontic appliances is the most common phenomenon. Therefore, it is necessary to insist on brushing teeth carefully after each meal.