The immune reactivity of the elderly organism is not as good as that of young people, and most of them suffer from systemic diseases, such as diabetes, cardiovascular and cerebrovascular diseases, so the medication is more and more complicated. Therefore, after the invasive operation such as subgingival scraping treatment, need to pay more attention to the daily diet, the details are as follows: 1, most of the elderly periodontitis is more serious, the root exposure of the tooth pulp state stimulation is more obvious, need to avoid eating too cold, too hot, too hard food, so as not to further stimulate the pulp condition, increase the burden of periodontal tissue, affect the effect of periodontal subgingival scraping; 2, avoid the intake of easy to adhere to the tooth Avoid intake of foods that can easily adhere to the tooth surface, such as candy, to avoid excessive adhesion to the tooth surface, which increases the difficulty of plaque control and affects the effect of scaling; 3. Increase the intake of various types of fresh vegetables, fruits and high quality protein to facilitate the healing of the postoperative tissue and improve the therapeutic effect of subgingival scaling.