Because many orthodontic patients wear braces for a long time, remove the braces as if liberated, will not pay much attention to wearing retainers. In fact, this is very wrong, the retainer to straighten the role of beautiful teeth can not be ignored: a. Orthodontic maintenance is very important, must pay attention to. If you don’t wear a retainer after orthodontics, the recurrence rate is 100%, that is, the previous laborious, time-consuming and costly orthodontic works all for nothing. Second, keep time: generally, keep at least two years. The first year after the end of orthodontic treatment to wear retainers 24 hours a day (only when eating and brushing can be taken off); the second year can wear 12 hours a day, that is, day wear or night wear; two years later, you can gradually shorten the wearing time, and pay attention to wear retainers after a period of time there is no change in the tightness, if the tightness of a longer interval no change, indicating that the teeth are stable at this time, can end to keep. Some special patients, such as periodontal disease patients, need to maintain lifelong. Third, the maintenance of retainer: 1. if not worn, it should be put in cool water to soak, not dry, so as to avoid dehydration and deformation of the plastic base of the retainer; 2. do not encounter hot water, also to avoid deformation of the plastic base. Fourth, keep the process of review: keep the process also need to review, usually is 3-5 months to review once on the line. The front lip arch of the retainer (i.e., the most front wire) should be attached to the tooth surface. After a long period of repeated removal, the front arch will inevitably loosen and become detached from the tooth surface, and it is time for a follow-up. For foreign patients, generally the local orthodontist should be able to adjust the retainer. The retainer should be adjusted so that the front labial arch and the tooth surface fit together just right, not too loose and not too tight.