DR. J.P. CASTEYDE / CNRI / SCIENCE PHOTO LIBRARY DR. J.P. CASTEYDE / CNRI / SCIENCE PHOTO LIBRARY
Fillings in a child's milk teeth. Dental X-ray showing multiple filled cavities in the milk (primary) teeth of a 6-year-old child. Cavities, or caries, are caused by acid produced by bacteria as they ferment food debris accumulated on the tooth surface, resulting in demineralisation and destruction of the hard tooth tissues.
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