Dental caries. Close up of dental caries (blackened cavity) in a lower molar tooth. Dental caries is the decay and crumbling of the teeth. It is caused by the bacteria in plaque,a substance which covers the surface of unclean teeth. The bacteria break down sugar in the mouth,producing an acid which progressively destroys the teeth. A filling may be used to repair a decayed tooth,but in severe cases,root canal surgery or tooth extraction may be required | |
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