DR ARMEN TARANYAN / SCIENCE PHOTO LIBRARY DR ARMEN TARANYAN / SCIENCE PHOTO LIBRARY
Close-up of a decayed lower incisor tooth being extracted. Dental caries is the decay and crumbling of the teeth. In severe cases, such as this, root canal surgery or tooth extraction is needed. The teeth also show signs of granulation, the build up of tartar formed from salts in the saliva around the gum line.
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