Orthodontic treatment is a form of orthodontic treatment, which is primarily a treatment for malocclusion, or the correction of teeth. Orthodontic methods mainly include fixed orthodontic treatment, movable orthodontic treatment and invisible orthodontic treatment. 1, fixed orthodontic treatment: fixed orthodontic treatment is the most commonly used clinical orthodontic treatment method, is also the most traditional, the best effect of orthodontic treatment. It is bonded brackets on the teeth, and in the brackets fixed archwire to complete the correction of the teeth method. The brackets are the most important, now divided into ordinary brackets, self-locking brackets and ceramic brackets. 2, movable orthodontic treatment: movable orthodontic treatment is mainly for the different malocclusions of the teeth produced by the orthodontic appliance can be removed, for children’s early correction of dental deformity is more common. 3, invisible orthodontic treatment: invisible orthodontic treatment is a relatively new method, mainly through the computer to assist treatment, the production of aligners to wear in the mouth. Invisible orthodontic treatment can be completely beautiful, convenient and comfortable. These three orthodontic methods are the most commonly used in the process of teeth correction. After the aligners are worn, retainers are also worn. The average correction time is about one to two years. The usual time for orthodontic treatment is during adolescence, when the most effective treatment for correcting malocclusions is done.