Subgingival calculus is made up of crystals that can grow into cemental irregularities and bond to tooth structure.These qualities are important to understand because they explain why:

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Subgingival calculus is often more tenacious than supragingival calculus due to its ability to grow into cemental irregularities and bond to tooth structure. This makes it challenging to remove during scaling and root planing procedures. Supragingival calculus, on the other hand, is often easier to remove as it does not have these same qualities.

Subgingival Calculus Is Made Up of Crystals That Can Grow