A hard deposit in the body. Calculus can appear and form on the surface of the teeth, or it can be a hard, small, crystalline mass that forms in a body cavity from particular substances on fluid such as urine, saliva or bile. These calculi (also called stones) can form in the bile ducts, gallbladder, bladder, kidneys, greeters or in the salivary ducts.
Occasionally some calculi don’t cause any symptoms. However some do cause extreme pain, in which case they need to be shattered, dissolved or surgically removed from the body cavity.