The causes of tooth movement, i.e. tooth loosening, can be physiological, such as tooth replacement in children or relaxation of periodontal support tissues in the elderly. There are also disease-related factors, including inflammation and pulpitis around the teeth, apical inflammation, tumors, and trauma. Measures such as anti-inflammatory treatment, root canal treatment, simple fixation, extraction treatment and surgical treatment can be taken. 1. Physiological factors lead to loose teeth: (1) Children’s tooth replacement: after normal performance, with the loosening of teeth will gradually fall off, without special intervention. (2) Loose teeth in the elderly: caused by the gradual atrophy of the supporting tissues around the teeth, in order to maintain the stability of the teeth, external fixation can be done. 2. Loose teeth caused by disease factors: (1) Inflammation and pulpitis around the teeth: simple inflammation around the teeth leads to loosening, you can take oral anti-inflammatory drugs (metronidazole, etc.), pulpitis can be treated with root canal therapy and then set of crowns, and external fixation can be done if loosening is obvious. (2) apical inflammation: apical inflammation caused by bone resorption around the tooth obviously loose, local infection, through conservative treatment is ineffective, part of the population can only choose to extract the tooth. (3) Tumor: Tumor and tumor lesions around the root tip can cause tooth loosening, and the symptoms can be improved after surgical treatment. (4) Trauma: Trauma can cause tooth loosening, and external fixation is the main choice to prevent tooth loss. Loose teeth are obviously accompanied by obvious symptoms of redness, swelling and pain, need to consult a doctor in time, under the guidance of the clinician standardized treatment.