A The salivary glands include the parotid (lying along the jawline beneath the ear), submandibular (under the jaw) and sublingual (under the tongue) pairs of glands, along with a large number of minor salivary glands. The parotid and submandibular glands drain into a single duct each, but the sublingual glands drain into eight to 20 ducts, so obstruction by a stone is rare.
Salivary duct stones - called 'calculi' - are generally made up of calcium carbonate and calcium phosphate. Symptoms include swelling of the face or neck, pain in the face or mouth and a dry mouth. These symptoms are usually most noticeable while eating or drinking.
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