The most common clinical condition of blood in the mouth is bleeding gums, and the most common condition of bleeding gums is called gingivitis. If gingivitis develops further, it may develop into periodontitis. Blood in the mouth is the most common clinical manifestation of gingivitis, which can usually be solved by localized cleaning. Cleaning is also called supragingival cleaning, usually called scaling, scaling that can solve the problem of plaque and tartar around the gums, to maintain the health of the periodontal tissues and reduce the occurrence of bleeding. However, if there are some systemic diseases, such as high blood pressure or blood system diseases, such as hemophilia, poor coagulation mechanism, there may also be bleeding gums, blood in the mouth. In addition, oral anticoagulant medications, such as aspirin and clopidogrel, may also cause bleeding in the mouth.