Dental caries, also known as tooth decay or cavity, is a disease wherein bacterial processes damage hard tooth structure. These tissues progressively break down, producing dental caries (cavities, holes in the teeth). If left untreated, the disease can lead to pain, tooth loss, infection. Dental cavities can be diagnosed by clinical or radiographic examination and can be treated by cleaning out the decayed portion of the tooth and filling it with a tooth coloured bonded composite filling. If there is an extensive break down or loss of tooth structure then a larger restoration like an inlay, onlay or crown may be advised. Prevention of decay is always a better option and can be done by following a good oral hygiene program and visiting your dentist every six months.