With the increasing number of the orthodontic patients, the relationship between periodontal and orthodontic becomes increasingly close. Orthodontic treatment can improve periodontal status, but the adverse clinical problems of perio-dontal tissue during orthodontic treatment are relatively common. In this paper, we discuss the problems of soft tissue, including causes, prevention, and treatment of gingivitis, gingival enlargement, gingival recession, and gingival invagination in ortho-dontic treatment.
