Bleeding from brushing teeth is usually caused by incorrect brushing, gingivitis, blood system diseases and other reasons. 1. Incorrect brushing: brushing with a hard toothbrush head, brushing harder, sawing across the teeth, and other incorrect brushing methods are prone to damage the gingival papillae, resulting in gingival capillaries being stimulated and then broken, resulting in bleeding teeth from brushing. 2. Gingivitis: poor oral hygiene, plaque stimulation, food congestion and other reasons lead to gum inflammation, resulting in swelling of the gums, congestion, when brushing due to mechanical stimulation caused by bleeding gums, usually after brushing the gum bleeding can stop. 3. Blood system diseases: leukemia, thrombocytopenic purpura and other blood system diseases lead to less platelets in the patient’s body, the blood can not be normal coagulation, there will also be bleeding when brushing teeth, usually accompanied by a larger amount of bleeding. If the situation of bleeding teeth when brushing teeth should be timely consultation, under the guidance of the doctor to improve the examination of clear diagnosis and treatment, daily attention to the use of scientific and reasonable way of brushing teeth.