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Calculus (dental)In dentistry, calculus or tartar refers to hardened plaque on the teeth, formed by aging in the presence of saliva, debris, and minerals. Its rough surface provides an ideal medium for bacterial growth, threatening the health of the gums and absorbing unaesthetic stains far more easily than natural teeth.
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Calculus (dental)".