Trauma, biting on something too hard or periodontal disease of the gums can lead to loose teeth and consequently painful bites that affect eating and life, which can be treated periodontally depending on the situation. Excessively loose teeth are often due to reduced resorption of the bone around the tooth, like the roots of a tree experiencing soil erosion, and it is often difficult to retain the tooth. If the tooth is slightly loose due to an injury, a prompt dental visit to the dentist for a radiograph should be made to prevent any undetected root fracture, and a loose tooth fixation treatment can be done by the dentist according to the situation when the loosening is obvious. Gum damage heals quickly, but it often takes about 4-6 weeks for the teeth to stabilize, during which time chewing or biting should be avoided, and soft food should be adhered to during the injury period, and the teeth should not be pushed by hand. One of the most common causes of unexplained painful loose teeth is underlying gum and periodontal inflammation. Periodontitis is a very common infection and most adults have varying degrees of periodontitis, which manifests as easy bleeding when brushing, swollen gums, bad taste in the mouth, and even loosening and loss of teeth. Periodontitis is caused by the accumulation of calculus near the gum margins. If not removed, it will continue to irritate and destroy the gum tissue and alveolar bone. By removing this calculus completely through scaling and periodontal scaling, tooth loosening may be improved. However, it should be noted that when the alveolar bone is reduced, it will be difficult to grow back. Periodontal problems should be detected and treated early to prevent tooth loosening so that “old tooth loss” will not become a common problem.