For serious deformities such as “Diastema”, it should be treated as soon as it is detected, the sooner the better; if there is no abnormal jaw development and serious misalignment of the occlusal relationship, it can be corrected after the receding of the milk teeth, usually around 12 years old. In addition, the timing of orthodontic treatment varies from person to person and is not set in stone. The best time for orthodontic treatment can be determined only after the necessary examination to achieve the best results. Patients over 18 years old miss the best time, but with careful cooperation and proper diagnosis by the doctor, good results can be obtained. Orthodontic treatment for most people requires two phases: the active orthodontic phase and the maintenance phase. The active orthodontic phase varies from six months to two years depending on the condition of the teeth, with a follow-up visit every half month or month. The maintenance phase, which is the phase of wearing retainers after the active orthodontic treatment is completed, takes about one to two years for most people, and this phase can be reviewed at intervals of three months or six months. How should orthodontics be performed? 1.Surgical orthodontics There are some malocclusions that cannot be solved by simple orthodontic treatment, and some corresponding surgical procedures must be done, together with general orthodontic treatment, in order to achieve satisfactory orthodontic effects. Therefore, surgical orthodontics is also called surgical orthodontics, or joint orthodontics. 2.General orthodontics is the “iron teeth” orthodontic treatment method that we usually see, using bonding agent to cement the orthodontic device on the teeth, the patient can not take it off by himself, only by the orthodontist to install and remove, adjust the force. The orthodontist can only install and dismantle the braces and adjust the force. Once a month, the orthodontist will gradually increase the force to make the teeth move and reach the ideal state as designed. After removing the aligner, you have to wear a retainer for a period of time to consolidate the orthodontic results and prevent relapse. 3.Invisible orthodontics Invisible orthodontics is to install all the aligners on the lingual side of the teeth for orthodontic treatment, so it is also called lingual orthodontics. This orthodontic method is invisible from the outside of the aligner, orthodontic treatment during the normal social and professional activities can still be carried out. Unknowingly, the alignment of teeth is changed and the facial image is changed. 4.Crown orthodontics The crown orthodontics is the most advanced orthodontic technology, using 3D digital positioning technology, combined with the face shape, skin color design dental program, after correction of teeth strong, beautiful and generous. It can improve the lip shape, face shape and bite jaw relationship on the same day after orthodontic treatment. It only takes 7 days before and after orthodontic treatment, and 7 days can let you have a standard smile with 8 teeth showing instantly; it can be said that crown is the best choice for adult teeth correction.