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.
And the last paragraph --
Finally, you may wish to consider alternative treatments such as the homoeopathic remedy Calculus renalis. This - as the name suggests - is derived from kidney stones but, nevertheless, is reported to also work on salivary stones, which respond by growing smaller and being reabsorbed. Also, traditional Chinese herbal medicine uses various herbs in combination to treat and prevent salivary stones. As these medicines work holistically, you may wish to see a Chinese herbalist to get the combination that best suits you.