Dental calculus is a white-yellow or gray colored hard formation that occurs when the bacterial plaque formed on the surface of natural teeth or prothesis is mineralized. It can occur on a single tooth or on a group of teeth or on all surfaces of teeth in the mouth. It can be supragingival (above the gingiva) or subgingival (under the gingiva). Descaling

, that is, the cleaning of the tartar, performed by the dentist does not harm the teeth in any way and the tartar must be cleaned in order to have healthy teeth and gum.