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There is much debate about the amount of saliva that is produced in a healthy person per day; estimates range from 0.75 to 1.5 litres per day while it is generally accepted that during sleep the amount drops to nearly zero.
Problems can develop with the glands that produce saliva, including swelling, infection, cysts, tumours and salivary gland stones. Your salivary glands produce up to around 1.5 litres of saliva (spit) a day. It gets into the mouth through ducts or tubes called salivary ducts.