Braces retainers are required to be worn for at least 2 years. 1. Since the tendency of recurrence may always exist after the completion of orthodontic treatment, it is generally required to keep the retainer for at least 2 years after the completion of orthodontic treatment. Usually, it is required to wear the retainer all day long in the first year, and then adjusted according to the specific conditions of the patients from the second year onwards, and gradually transitioned to night time, and it is even required to keep the retainer for life for some special malocclusions. 2. According to the different needs of different types of orthodontic treatment, the retention program can be divided into limited-term retention, long-term retention and natural retention. How long the retainer should be worn should be evaluated according to the actual situation of the patient, and it is recommended to consult your attending doctor to achieve good treatment results.