Localized causes of bleeding gums are common in patients suffering from gingivitis and periodontitis. These patients produce tartar in the areas around the gum margins due to infrequent brushing, or incorrect brushing methods. Tartar is a hard, lime-like substance that irritates the gums, causing them to become inflamed, swollen, and congested. In mild cases, the gums bleed when brushing, sucking, biting hard objects, or flossing; in severe cases, they bleed even when they are slightly irritated or not irritated, such as when inflammation or high fever causes changes in the vascular structure of the gum tissue, which can also cause bleeding. Gum bleeding due to oral diseases is mostly seen in gingivitis and periodontitis. In addition, ill-fitting dentures, food impaction, and periodontal injury can cause gum bleeding. Some of them will leave bleeding marks on the toothbrush. When people encounter this situation, there is no need to worry because this kind of bleeding will stop soon after the brushing is finished. In addition, if the caries has destroyed the crown of the tooth (medically called the residual crown), there is sharp enamel tissue on the surface of the residual crown, which is like a knife cutting the gums and causing the gums to bleed; some people eat carelessly and pierce the bone into the gums, which can also cause the gums to bleed, but this bleeding only happens in the gums of individual teeth, and the bleeding will stop after the residual crown is removed and the bone spur is removed; some people use the toothpick improperly and pick the gums to bleed. Some people bleed due to improper use of toothpicks, which will stop as soon as they stop flossing or correct the method of using toothpicks. There is also a part of gum bleeding caused by systemic diseases, this kind of gum bleeding is often one of the clinical symptoms of systemic diseases, it is helpful for the diagnosis of systemic diseases, and the treatment should be especially careful.