Periodontitis is generally a disease that occurs as a result of inflammatory infection of the periodontal tissues. Patients suffering from periodontitis will experience symptoms such as loose teeth, periodontal pocket formation, and periodontal pus overflow. Usually periodontitis is caused by dental calculus, traumatic occlusion, and other factors. 1. Calculus: It is the main cause of periodontitis in teeth. It is usually due to the excess food residue staying on the surface of the body after eating and not being removed in time, which will form calculus in the long run; or consuming some richly colored foods for a long time, such as tea, cigarettes, coffee, etc., which can easily lead to pigments staying on the surface of the teeth and finally forming calculus. 2, traumatic bite: normal bite are within the range of periodontal tissues can withstand, if excessive bite, usually will cause trauma to periodontal tissues, but also easy to lead to periodontal disease in the body. 3, other: daily life without good living and eating habits, such as open mouth breathing, or not brushing on time, food clogged in the teeth for a long time, it is easy to lead to the formation of periodontal pockets, and finally cause periodontitis. Usually periodontitis is caused by the above-mentioned reasons, and it is recommended to go to the hospital for timely consultation. Prevent the inflammation from becoming too great and causing damage to the nerves of the teeth.