El cálculo dental, también denominado sarro o tártaro dental, es la acumulación de sales de calcio y fósforo sobre la superficie dental. Se trata del resultado de la mineralización de la placa bacteriana, esto es, del conjunto de microorganismos, saliva y restos alimenticios que se van depositando sobre las piezas dentales. El sarro se compone de una parte orgánica y otra inorgánica, donde predominan el calcio y el fósforo.

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In dentistry, calculus or tartar is a form of hardened dental plaque. It is caused by precipitation of minerals from saliva and gingival crevicular fluid (GCF) in plaque on the teeth. This process of precipitation kills the bacterial cells within dental plaque, but the rough and hardened surface that is formed provides an ideal surface for further plaque formation. This leads to calculus buildup, which compromises the health of the gingiva (gums). Calculus can form both along the gumline, where it is referred to as supragingival ("above the gum"), and within the narrow sulcus that exists between the teeth and the gingiva, where it is referred to as subgingival ("below the gum"). Calculus formation is associated with a number of clinical manifestations, including bad breath, receding gums and chronically inflamed gingiva. Brushing and flossing can remove plaque from which calculus forms; however, once formed, it is too hard and firmly attached to be removed with a toothbrush. Calculus buildup can be removed with ultrasonic tools or dental hand instruments (such as a periodontal scaler).

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