Bleeding gums are mostly caused by local factors. For example, unclean mouth and the presence of calculus around the teeth. Tartar is soft and calculus is hard. Since the gums are constantly stimulated by tartar and calculus, combined with the presence of many bacteria in the mouth, the various harmful substances produced can lead to inflammation of the gums and bleeding when brushing the teeth. Bleeding caused by such factors should be removed by a doctor with special instruments to remove tartar and calculus, and then coated with some medication, and the bleeding will soon improve. Blood on the bristles when brushing teeth and blood on food when biting food indicates gingivitis; teeth with different degrees of looseness, exposed roots or red, swollen and pusy gums indicate that periodontitis has developed; then a dentist should be called in time for examination and treatment. In addition, there are many causes of bleeding due to systemic factors, the common ones are vitamin C deficiency, thrombocytopenia, hemophilia, etc. Hemophilia occurs only in male children. In a few patients, there are both local and systemic factors, which should be treated seriously and actively.