Periodontal disease is the most common oral disease of the elderly, a disease that affects the supporting tissues of the teeth, including the gums. The etiology is complex and is prone to recurrence after treatment. Treatment should be a comprehensive approach that requires close cooperation between the patient and the doctor. Therefore, during the treatment of periodontal disease, it is important to improve self-care in addition to regular checkups, regular full-mouth supragingival and subgingival periodontal scaling, necessary anti-inflammatory treatment and treatment for systemic diseases in cooperation with internal medicine doctors. 1. Develop good brushing and rinsing habits, control plaque and actively quit smoking; 2. Reasonable nutrition plays an important role in the recovery of periodontal disease and the repair process of periodontal tissues. ① Develop a balanced dietary spectrum suitable for patients with periodontal disease, paying special attention to the adequate supply of protein, vitamin C, B and D, and the supply of calcium, phosphorus and iron to promote the repair of periodontal tissues. Foods beneficial to gums: corn, rice, carrots, cabbage, lettuce, celery, tomatoes, apples, pears, oranges, peanuts, milk, eggs, fish, tea, etc. ② The degree of softness and hardness of food and the amount of fiber has a direct impact on the loosening of teeth caused by periodontal disease and the uneven strength of the teeth bite. Reasonable deployment of dietary softness and hardness and fiber content, to reduce the clinical symptoms of periodontal disease is beneficial.