Plaque is a sticky, soft film of bacteria that builds up on your teeth, dental fillings, gums, tongue, dentures and crowns.
When multiple layers of plaque combine with minerals present in your saliva, it hardens into a white, chalky calcified substance called tartar.
It create a breeding ground for the oral bacteria that feed on sugars from the food you eat. Plus, it forms acid during this process that breaks down the tooth enamel, leading to dental cavities. Bacteria also produce toxins causing various periodontal (gum) problems.