Gum recession should be scaled, causing gum recession means that the teeth have developed symptoms of periodontitis, the typical symptoms of periodontitis are loss of attachment, gum recession, alveolar bone resorption, and loosening and loss of teeth. If gum recession has already appeared, simple scaling will not achieve particularly good results because subgingival tartar has already appeared, and scaling mainly targets supragingival tartar. Gum recession needs to be further increased by subgingival scaling, and if the effect is still unsatisfactory, root surface leveling and periodontal membrane gingival surgery should be added to try to slow down or even stop gum recession, because periodontitis is the cause of The number one risk factor for total tooth loss in middle-aged and elderly people and must be intervened as early as possible.