Frequent bleeding of the teeth may be due to vitamin C. Vitamin C is an essential vitamin and if deficiency occurs, the body will develop scurvy, which clinically manifests as bleeding gums. But nowadays, patients with scurvy caused by vitamin C deficiency are becoming less and less common, because vitamin C is more often found in fresh vegetables and fruits, and patients nowadays are in most cases taking enough vitamin C. Therefore, the majority of the reasons for frequent bleeding of teeth are now due to gingivitis. Gingivitis is caused by poor oral hygiene, resulting in a large amount of plaque, food debris, and tartar deposits around the teeth, food debris, tartar, and plaque provide a breeding ground for bacteria, the continuous development of bacteria, resulting in inflammation of the periodontium and gums, the typical symptoms are redness, swelling, flaccidity, and bleeding of the gums, the most common manifestation is bleeding from brushing and biting hard objects.