You may not know that for a “healthy” person with periodontal disease, such as chronic periodontitis or even periodontal abscess, every time you brush your teeth, it is a process of bacteria entering the bloodstream, that is to say, because of dental disease in the mouth, when you brush your teeth, the bacteria in your mouth may enter our bloodstream directly, and the bacteria enter the bloodstream and move around with the bloodstream. When we meet the right time and place, for example, we have congenital heart disease, heart structure is not normal, or we have had heart surgery before, there are artificial valves, artificial forming rings or other foreign bodies implanted in the heart, the bacteria into the blood when our resistance is low, will take hold in these places, take root and sprout…. … This is the cause of some infective endocarditis. It is by no means sensational to say that the trouble comes from the mouth. Because once infective endocarditis occurs, it is simply the beginning of a tragedy. This is a classic example of a minor illness that goes untreated becoming a major disease.