Sialolithiasis refers to the formation of stones in the salivary glans. Stones are most commonly found in the submandibular gland, where stones can obstruct Wharton's duct. It is frequently associated with chronic infection (Staphylococcus aureus, Steptococcus viridans) of the glands, dehydration (phenothiazines), and/or increased local levels of Calcium, but in many cases can arise idiopathically. Pain, when present, usually originates from the floor of the mouth, although in many cases the stones cause only intermittent swelling.