When black triangle teeth appear, the following treatment measures can be taken: 1, the cervical part of the tooth and root surface attached to a large amount of calculus, compression of alveolar bone resorption, gingival recession, you can carry out subgingival scraping and root surface leveling to promote the formation of new periodontal tissue, if necessary, you can turn over the gingival flap, cover the root surface with bone powder and periosteum to guide the generation of new alveolar bone. 2, if the black triangle area is large, affecting the appearance, you can make adjacent inlays 3. If the traction force is too large during the orthodontic process, which causes the black triangle, the orthodontic force can be reduced and the adjacent surface of the teeth can be sliced or ground to change the adjacent junction, so that the triangle gradually disappears.