Bleeding teeth may be caused by lack of vitamin C, periodontitis, leukemia and other factors. 1. When lacking vitamin C, collagen synthesis is affected, and the brittleness of terminal capillaries is increased, and patients will have symptoms such as bleeding gums and bleeding. 2. When periodontitis, the gums appear red, swollen, bleeding and other phenomena, and gradually the teeth are loose or even fall off, and some patients are accompanied by bad breath and other phenomena. Treatment is mainly to maintain gum hygiene, the use of antibiotics such as metronidazole anti-infection treatment, during the treatment period, pay attention to diet light, avoid cold, spicy food. Gum swelling is serious, if necessary, incision and drainage of pus. 3. Leukemia patients due to platelet production disorders, patients are often accompanied by systemic bleeding, bleeding gums, nosebleed is a common symptom. There may be other causes, if you feel uncomfortable, consult a doctor immediately.