A brushing gum bleeding reasons are:1, long-term use of aspirin, Polivic and other anticoagulant drugs, or suffering from leukemia, liver dysfunction, allergic purpura and other diseases, systemic coagulation disorders, the gums will appear spontaneous bleeding. 2, poor oral hygiene, long-term attachment of the deposit of food residues and soft scale on the tooth surface will mineralize and form calculus, stimulating the gums red and swollen bleeding, while capillaries within the gums The gums will tear and bleed when brushing with force. 3. The presence of bad restorations on the crown of the teeth will press and stimulate the gums, while causing the accumulation of plaque, making the gums edematous and easy to bleed, and the symptoms will disappear after removing the bad restorations.