A: Oral health is the health of your mouth, including your teeth, gums, throat, and bones around the mouth. Oral health problems, such as gum disease, might be a sign that you have other health problems. Gum diseases are infections caused by plaque, which is a sticky film of bacteria that forms on your teeth. If left untreated, the bacteria in plaque can destroy the tissue and bone around your teeth, leading to tooth loss. Infections in your mouth can also affect your unborn baby if you are pregnant.