Periodontal disease is a chronic disease that mainly occurs in periodontal tissues, including gums, periodontal membrane, dentin and alveolar bone, manifested by red, swollen and bleeding gums, bad breath, alveolar bone resorption, and gradual loosening or loss of teeth. Periodontal disease is an infectious disease caused by microorganisms. The plaque that exists under the gums is the initiating factor of periodontal disease, and the plaque calcifies into tartar, which is always covered by bacteria, stimulating inflammation of the gums and forming periodontal pockets, which aggravates periodontal inflammation. Food impaction is also a common cause of localized periodontal tissue destruction. There are also bad restorations, malocclusion, bad habits (bruxism, tongue spitting), smoking, endocrine influence, heredity, blood diseases, nutrition and other factors cause disease. In short, periodontal disease is a multifactorial disease, and the harm is very great, is the main disease leading to tooth loss, should get people’s attention. Treatment of periodontal disease should first completely remove tartar, that is, cleaning, local stimulus eliminated, periodontal situation will be greatly improved. Then after fine, reasonable adjustment of the teeth, quit bad habits. Patients should also pay attention to oral hygiene, regular (half a year or so) active cleaning, so that the oral cavity to maintain long-term cleanliness and hygiene, to prevent periodontal disease. Periodontal disease has some common symptoms, when the patient self-examination, found that these symptoms, should be as early as possible to seek medical treatment, according to the situation of the appropriate treatment. These symptoms include: mild bleeding gums is an indication of early gingivitis, brushing teeth with blood on the bristles, biting food with blood on the food, indicating gingivitis; look in the mirror if you find that there is redness and swelling of the gums, a touch of bleeding, indicating that there may also be gingivitis; teeth have varying degrees of looseness, tooth gap becomes larger, the root of the tooth is exposed or red and swollen gums, pus, indicating that the gums have progressed to periodontitis; there is bad breath indicating that there may be Periodontitis. Female pre-pregnancy, adolescents and patients with chronic diseases such as diabetes and hypertension should be the focus of regular oral examination in the hospital for preventive treatment of periodontal disease. Periodontal disease is one of the two most common diseases of the oral cavity. Therefore, the prevention of periodontal disease is very important. Generally speaking, the prevention of periodontal disease can be carried out from five aspects: 1, to develop good oral hygiene habits. (1) daily serious and effective brushing twice a day, pay special attention to the removal of teeth and the edge of the plaque; (2) the use of dental floss and other dental cleaning appliances to remove plaque adjacent to the teeth; (2) eat healthy food, such as meat, eggs, soy products, dairy products, a variety of vegetables and fruits and so on. Smoking is an aggravating factor for periodontal diseases, so it is recommended to quit smoking. 4.Self-awareness of periodontal disease. (1) when brushing the toothbrush with blood on the toothbrush, bite the food when there is blood on the food, indicating that there is gingivitis; (2) when looking in the mirror, found that the teeth are red and swollen, a touch of bleeding, indicating that there is gingivitis; (3) the teeth have a varying degree of looseness, the roots of the teeth are exposed or the gums are red, swollen and pus, indicating that the development of periodontitis; (4) there is bad breath indicating that there may be periodontitis. Slight gum bleeding is an indication of early gingivitis, at this time should not stop brushing, but it is appropriate to use soft-bristled health care toothbrush brushing, brushing water can be used warm salt water. After each brushing, continue to rinse with warm salt water for a few minutes. If there is still gum bleeding after a week, you should find a dentist for examination and treatment in time. 5. Regular checkups. (1) Regular oral examination, preferably once every six months; (2) Regular cleaning (i.e. scaling). The doctor uses special instruments to remove the calculus attached to the teeth, not less than once a year. Patients with periodontal disease are advised to have their teeth cleaned every quarter or six months.