Hardened colonies: Bacterial colonies that start on your teeth as soft plaque become calcified over time, and the calcified colonies are then classified as calculus.
Answered 1/23/2014
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Plaque and Calculus: Plaque is a gummy substance that forms on the teeth within a few hours after food. Plaque can harden, and when it does, it is then called tartar.. Calculus = (tartar) is a form of hardened dental plaque.
Answered 8/8/2015
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