What is the difference between plaque and calculus?

Plaque is a clear, sticky deposit of bacteria that forms and tenaciously adheres to the surface of teeth and gum tissue.  Plaque can begin to develop in as little as 4 hours after brushing.  Research shows that plaque is a primary cause of tooth decay and gum disease.  Plaque can be removed with brushing and flossing.

Calculus, also known as tartar, is the hardening of plaque that has aged if left behind after brushing.  To minimize, we encourage brushing at least twice a day and flossing daily.  Once plaque turns into calculus only a dentist or dental hygienist is able to take it off.