Plaque is a type of buildup that occurs throughout the body. Plaque that occurs in the arteries is dangerous to your heart health, and plaque that occurs in the mouth is dangerous to your oral health. Dental plaque is a soft, white, sticky film that builds up on the teeth each day. Your mouth is home to millions of bacteria, and they react to the foods and beverages that you eat after every single meal, snack, breath mint, soft drink, or cup of coffee. Because bacteria are constantly at work inside your mouth, your mouth is constantly assaulted by plaque buildup.