Dental bleeding refers to bleeding of periodontal tissues, mostly seen in periodontitis, oral ulcers and blood system diseases. 1. Periodontitis: because the patient’s teeth surface plaque calculus too much, bacteria and microorganisms infect the surrounding soft tissue, triggering an inflammatory reaction, gums red, swollen and painful, serious cases will lead to capillary rupture bleeding, the need for regular dental cleaning and daily cleaning teeth in place. 2. Mouth ulcers: patients eat too spicy and too stimulating food for a long time, triggering red and swollen gums appear blood bubbles, when the blood bubbles rupture will cause bleeding, you need to ensure that the main diet of spaghetti and noodles, rinse your mouth in time to avoid infection of the rupture place after the meal, usually about 1 week can be healed on their own. 3. Blood system diseases: if the patient does not have any cause of dental bleeding, did not find red and swollen parts, recent diet, some patients accompanied by arthralgia, etc., need to be vigilant about leukemia and other diseases, it is recommended to the regular hospital to do the relevant examination to clarify. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.