In dentistry,<unk> or tartar refers to calcified deposits on the teeth, formed by the continuous presence of dental plaque.  Its rough surface provides an ideal medium for further plaque formation, threatening the health of the gingiva.<unk> absorbs unaesthetic stains far more easily than natural teeth.<unk> accumulations occur in the absence of adequate oral care. Once formed, it is generally too firmly adherant to teeth to be removed with anything available to an individual at home; patients with<unk> must therefore visit their dental professionals so that the<unk> can be removed with ultrasonic tools and specialized sharp instruments.
Calculus 
Granulation tissue
Neoplasm
Algae
Clavicle
Pseudopolyp
Demegestone
Granuloma