EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Tooth decay. Coloured scanning electron micrograph (SEM) of a decaying tooth. A hole, or cavity, can be seen in the foreground. Tooth decay occurs when there is a build up of plaque in the mouth. Plaque is the sticky substance made of food remains and naturally-occurring bacteria. Bacteria feed on the sugars in the food particles and produce acid as a waste product, which corrodes the enamel coating of each tooth. Eventually a cavity is produced, which exposes the pain receptors in the tooth's sensitive interior. Cavities are prevented by brushing and treated by fillings. Magnification: x2500 when printed 10 centimetres wide.
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