There are the following precautions after orthodontic treatment: 1. After treatment, the effect of treatment should be maintained. If the effect is not maintained, the teeth may relapse under the tendency of periodontal fiber recurrence. So after the end of dental treatment to wear a retainer to prevent the relapse of teeth. Wearing retainer is routinely two years, the first year day and night are worn, the second year at night; 2, after orthodontic treatment to periodontal, dental treatment, such as patients wearing orthodontic braces when brush teeth is not clean, resulting in red and swollen gums, with the appearance of calculus, to go to the periodontal department for periodontal treatment; 3, some patients in the treatment due to poor oral hygiene led to tooth decay, such as medium caries, shallow caries, after removing the braces to Go to dental department for restoration of dental defects. There are also patients such as tooth demineralization, etc., they have to go for corresponding treatment.