An American woman had an infection in a knee replacement with bacteria from the mouth found to be the cause. When gums bleed, bacteria can travel through the blood to the artificial joint. Usually the bacteria are quickly cleared quickly from the circulation by the immune system. Bacteria from tooth decay and bleeding gums can cause the bacteria to stream through the blood, and are known to be the cause of other infections in the body, such as in artificial joints or areas of scarring in the heart.
Good oral hygiene habits, brushing twice daily and flossing daily are required to keep the bacteria under control for healthy teeth and gums. Dental examinations and professional cleaning each 6 months eliminates teeth and gum infections or at least allows your dental professional to focus on them promptly.