1: primary prevention mainly refers to the prevention of periodontal disease, that is, the methods that should be taken before periodontal tissue is damaged to prevent the invasion of pathogenic factors; Or there are already pathogenic factors, but they have not caused periodontal disease damage. At this time, possible pathogenic factors should be removed immediately. In addition, oral health education will be given to everyone, so that everyone can establish the awareness of preserving oral health, help and guide everyone to master the correct brushing method, and learn to use interdental brush and floss. Let everyone understand the importance of regular oral examination and maintaining oral health, actively exercise and improve immunity. 2. Secondary prevention mainly requires early detection, early diagnosis and early treatment of periodontal disease, so as to reduce the occurrence of periodontal disease and control the further development of the disease. For the lesions confined to gingival tissue, effective professional scaling should be taken in time to remove the stimulating factors such as soft dirt, plaque and dental calculus in the mouth, so as to control the further development of the disease. Root planing and periodontal surgery were performed according to the periodontal condition. X-ray examination can be used to track and observe the alveolar bone regularly. In addition, it is necessary to remove bad restorations in the mouth and actively treat food impaction and dental caries. The periodontal tissue lesions were significantly improved.

3. Three-stage pre-treatment mainly refers to the maximum treatment of periodontal tissue damage with various drugs and periodontal surgery methods to prevent tooth loss and avoid dysfunction. If teeth are lost, it is necessary to repair the missing teeth in time. In addition, systemic diseases related to periodontal disease should be treated, such as diabetes, hematological diseases and nutritional deficiency. Nutritional and reasonable diet, enhance periodontal resistance.