When Dental Plaque remains on the teeth, it hardens to create Calculus (also known as Tartar). You cannot remove Calculus with a toothbrush; only a dental professional can remove it during an oral cleaning. To keep Plaque and Calculus under control, you need to brush your teeth twice every day, floss at least once a day, and see a dental professional for regular cleanings.
Synonyms:
Tartar