The most common cause of bleeding when teeth are sucked is gingivitis, excluding systemic and hematologic diseases. The main site of gingivitis is the free gingiva or gingival papilla, or what everyone calls gingivitis. The treatments for gingivitis are: i. Local treatment. Remove the cause of the disease, remove tartar with scaling, control plaque, and change all the factors that cause plaque retention and irritation of the gums, the inflammation of the gums can be eliminated within a few days or a week, the collagen fibers in the connective tissue are regenerated, and the color, shape, and quality of the gums return to normal. When gingivitis is heavy, local medication can be used with 1% hydrogen peroxide solution and 0.12%-0.2% chlorhexidine and iodine preparations; third, systemic medication, for patients with chronic gingivitis without systemic co-infections, systemic antibiotics are generally not used.