DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Dental filling. A woman undergoing dental treatment to fill a decayed tooth. Tooth decay (dental caries) is caused by the acids released by bacteria in plaque, a sticky mixture of food remains that builds up on teeth. Dentists treat tooth decay by drilling away the affected area and filling the hole with a tough mercury amalgam, cement or dental composite.
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