Tartar (also called calculus), is plaque which has hardened on the teeth. It may form at and below the gumline. Tartar can irritate the gum tissues and it provides plaque a larger surface area to grow ...

This image of DNA dating to approximately 1,000 years ago comes from a piece of mineralized dental plaque, or calculus, that was processed and then stained with a dye that latches onto DNA molecules.

Using advanced sequencing technologies, anthropologists demonstrate that human DNA can be significantly enriched from dental calculus (calcified dental plaque) enabling the reconstruction of whole ...

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