With the improvement of living standards, people’s awareness of health has gradually increased. However, most people pay more attention to the problem of whole body health and ignore the oral disease – periodontal disease. In fact, he is closely related to the health of the body. 1, gastroenteritis H. pylori can be detected in the dental plaque, especially in the subgingival plaque in the periodontal pocket of the lesion site of periodontal disease patients, the detection rate of H. pylori is higher. This shows that periodontal lesions may increase H. pylori infection, leading to chronic gastritis, gastric ulcers and gastric cancer. Diabetic patients are prone to severe periodontal tissue destruction, and in turn, periodontal disease can aggravate diabetes, making it difficult to control blood sugar. Therefore, when diabetes is accompanied by periodontal disease, it is important to treat periodontal disease at the same time as diabetes. 3, heart disease Periodontal disease can also become a chronic focal point of infection causing many systemic diseases, which causes acute or subacute infective endocarditis is the most obvious example of periodontal disease related to systemic health. Periodontal disease is an independent risk factor for the development of coronary artery disease and acute myocardial infarction. The proportion of patients with periodontal disease who develop these diseases is significantly higher than that of patients with non-periodontal disease. According to epidemiological surveys, pregnant women with periodontal disease are three times more likely to deliver prematurely than healthy pregnant women and have a 7.5 times higher risk of having low birth weight babies. When a pregnant woman has periodontal disease, certain periodontal bacteria and toxins can enter the bloodstream, which can directly or indirectly trigger labor movements and even affect the growth and development of the fetus.