Sticky plaque — food, saliva, and bacteria — starts to form on your teeth after you eat, releasing acids that attack tooth enamel. Untreated plaque turns into tartar, which builds under gum lines and is hard to remove with flossing. The longer it stays on your teeth, the more harmful it is. Bacteria in plaque causes inflammation and leads to gum disease. Having high blood sugar often makes gum disease worse.
The above article is from: WebMD.com