Dental bleeding mainly refers to bleeding gums, whether taking metronidazole is useful or not is related to the cause of the disease, if it is anaerobic bacteria caused by oral infections that lead to bleeding, taking metronidazole has a certain relief, if it is caused by other diseases, then taking metronidazole is useless. Metronidazole is mainly used for anaerobic infections and is not effective in controlling infections caused by other types of bacteria. When bleeding gums are caused by anaerobic infections, metronidazole can be taken orally for anti-infective treatment. If bleeding gums are caused by other pathogenic bacterial infections, other types of antibiotics, such as cephalosporin, are often necessary. There are a variety of diseases that can cause bleeding gums, such as periodontitis, chronic gingivitis, inflammatory gingival hyperplasia, etc., which require identification of the cause of the disease and then appropriate treatment, such as removal of tartar and periodontal surgery. In addition, hematologic diseases, cirrhosis of the liver, systemic lupus erythematosus and other systemic diseases may cause bleeding gums. Therefore, when bleeding gums occur, it is recommended to consult a doctor in time to clarify the cause of the disease and receive appropriate treatment. Medications should be taken under the direction of a physician.