Daily brushing and flossing will keep dental calculus to a minimum, but a professional cleaning will remove calculus in places your toothbrush and floss have missed.

Periodontal diseases are infections of the gums, which gradually destroy the support of your natural teeth. Dental plaque is the primary cause of gum disease in susceptible individuals. Bacteria found in plaque produce toxins or poisons, which irritate the gums. They may cause them to turn red, swell and bleed easily. If this irritation is prolonged, the gums separate from the teeth, causing pockets (spaces) to form.
Plaque can also harden into a rough, porous substance known as calculus (or tartar). This can occur both above and below the gum line. As periodontal diseases progress, the supporting gum tissue and bone that holds teeth in place deteriorate. If left untreated, this leads to tooth loss.
Professional periodontal treatment is an investment in the health of your mouth. During a dental check up, your dentist inspects the color and firmness of the gums to determine if any periodontal problems exist. A very small instrument called a periodontal probe is used to gently measure the depth between your teeth and gums.
Healthy gum tissue fits snugly around each tooth holding it in place and keeping it anchored to the bone. In later stages of gum disease, the gums pull away from the teeth forming pockets where bacteria settle. Deeper pockets are more difficult for you and your periodontist to clean, so it’s important to reduce them.