Periodontitis gum recession is due to the fact that periodontitis patients have varying degrees of resorption of the alveolar bone, and after treatment the inflammation subsides and the gums recede. It is also possible that some of the gums are removed after periodontal surgery and the wound heals, which can also cause the roots of the teeth to be exposed and recede. It can be improved by treating periodontitis, correct brushing and reasonable diet, etc. 1.Treatment of periodontitis: supragingival and subgingival scraping can be applied to remove tartar, treat food embedment and fill cavities, and apply anti-infection with nitroimidazole and tetracycline drugs, also local application of chlorhexidine acetate solution, and feasible guided tissue regeneration and dental implant treatment after inflammation control; 2.Correct brushing: insist on morning and evening Brush your teeth, preferably with a soft-bristled, small-headed toothbrush, and use anti-sensitive toothpaste. The correct use of dental floss, gap brushes and other tools, try to use mouthwash after meals to do a good job of oral hygiene; 3, reasonable diet: can eat more fresh fruit, supplement vitamin C, vitamin E. Also supplement calcium, phosphorus, selenium and other minerals, reduce the intake of acid, sweet food and drinks; 4, other: if there is obvious gum recession, affecting the aesthetics, can choose to use elastic prosthetic gums to restore the normal gum shape, and pay attention to daily cleaning.