Your saliva contains certain minerals that are readily absorbed by the bacterial plaque, giving it an increasingly hardened and calcified finish.
This bacterial film that usually starts at the gumline and extends all across the surface of your teeth is referred to as plaque. If you clean your mouth improperly and continue to consume a diet rich in carbohydrates or sugar on top of that, these bacteria will proliferate and blanket your gums and teeth. These microorganisms feed on the sugars and starches found in food particles and release acidic by-products during the process, which chip away the tooth enamel over time. Your mouth is naturally populated with several strains of bacteria, both good and bad.
