Bacterial plaque is a deposit of microorganisms that forms a biofilm on the surfaces within the mouth. The dental biofilm is formed by macromolecules that adhere to the tooth surface by electrostatic forces. Bacterial colonization then occurs, which is the adherence of microorganisms to the dental film. The adhesion between microorganisms occurs thanks to a substance that the organisms themselves secrete; this phenomenon is called coaggregation. Calculus or dental tartar is formed by mineralization of the bacterial plaque, and it accumulates both on natural teeth and on prostheses. Differentiation is made between supragingival calculus at the margin of the gingiva, of a whitish or yellowish color, that is easily removed, and subgingival calculus in the gingival pocket, which is of a darker color and it is more firmly adherent (1)(2)(4).