CALCIFY: See: Mineralize. CALCULUS, DENTAL (Tartar ): A hard concretion that forms on teeth or dental prostheses through calcification of bacterial plaque. SUBGINGI VAL (Seruminal) C.: Calculus formed apical to the gingival margin; often brown or black, hard, and tenacious. SUPRAGINGI VAL (Salivary) C.: Calculus formed coronal to the gingival margin; usually formed more recently [&hellip