Loose teeth are mostly caused by periodontal disease gum atrophy, external impact or nutritional atrophy of old gums, regardless of the cause, ultimately belong to periodontal problems, which in medical terms is a lack of gum nutrition or gum atrophy caused by serious periodontal disease and caused by loose teeth. First, the harm of loose teeth: loose teeth will be chewing function or loss, affect the beauty of the face, affect the pronunciation function, have a negative impact on the remaining teeth, some will also cause temporomandibular joint disorder, and so on. Second, the causes of loose teeth: 1, periodontitis is the most important cause of loose teeth, can lead to alveolar bone resorption and gum recession, the most direct consequence is the occurrence of a series of phenomena such as loose teeth, gaps become larger, food embedding. 2, impact, fall or excessive bite, can make the teeth shake. This is because the external excessive force makes the periodontal membrane injured and the teeth become loose. 3, periodontitis or periapical periodontitis acute attack of gum redness, swelling and pain, common bleeding when brushing teeth, will appear loose teeth. 4.The teeth will loosen when the bite force of individual teeth is too large or the bite relationship is abnormal. 5.Although aging is not the main cause of loose teeth, we all know that one of the main signals of dental aging is the increase of loose teeth. When the periodontal tissues of middle-aged and elderly people shrink, the supporting force will be weakened and the phenomenon of loose teeth will appear. Third, loose teeth precautions: 1, during periodontal treatment, should not eat cold, hot, sour, sweet and other foods, do not bite hard things with teeth, such as small walnuts, sticks, pine nuts and other dried fruits with hard shells, to protect the gums and consolidate the roots of the teeth. 2, prevention and control of inflammatory oral diseases. Periodontitis, calculus, mouth ulcers, gingivitis, gum abscesses, food impaction and bad dentures are all causes of gum recession, so you should go to the hospital regularly for examination and treatment and consultation on oral self-care knowledge; for gums that have receded, they should be treated properly and in a timely manner.