Teeth are made up of tissues that do not shrink. Clinical shrinkage phenomenon is most commonly seen in the gums, the gums themselves have physiological shrinkage, which is why the middle-aged and elderly gums will appear to be lower than young people, but physiological shrinkage will not affect the loosening of the teeth and the whole of the bite. Clinically, the most common disease that causes gum recession is periodontitis, which is typically characterized by gum recession, alveolar bone resorption, and loosening of the teeth. For periodontitis, the best treatment is to go to a professional dentist for basic periodontal treatment, including supragingival cleaning, subgingival scraping, root planing, periodontal surgery, etc., the better control in order to make the gums no longer recession.