On average, plaque (bacteria and food debris) and its more adherent cousin, tartar or calculus (plaque and calcium) build up on the teeth over a six-month period. Because these lead to gum disease and decay, we suggest the accumulations be removed twice a year. Some patients build up tartar even more quickly due to a genetic predisposition or an inability to effectively brush and floss their teeth; these patients may need dental prophylaxis more often, sometimes three or four times a year. This is especially true in patients with periodontitis, a more severe form of gum disease.