If the teeth become loose, different treatment plans should be determined according to the degree and reason of the loose teeth: First, if the teeth become loose due to periodontitis, it should be determined according to the degree of periodontitis. For moderate periodontitis, full mouth scaling should be carried out, such as supragingival scaling and subgingival scaling, and long-term maintenance and health care of periodontal tissue should be carried out, so that loose teeth may be better without loosing. If it is severe periodontitis, it may even require bone grafting and gingival plastic surgery to improve tooth mobility. 2、 If the tooth looseness is caused by periodontal abscess, the abscess should be removed, inflammation should be removed, and anti-inflammatory drugs should be given. The tooth looseness may be cured. 3、 If tooth looseness is caused by periapical inflammation, root canal therapy should be performed on the affected tooth to completely remove periapical inflammation, and tooth looseness may be cured.