Some salivary glands also secrete blood group antigens that have been used to identify criminals. The parotid gland is located in front of the ears. The sublingual gland is found below the tongue and the submandibular gland is positioned behind the chin. The submandibular gland can occasionally cause an embarrassing stream of saliva to shoot from the mouth during a wide yawn or lively conversation. Saliva is produced in cycles.
Saliva levels are highest during winter mornings.
You produce the least amount of saliva when you are seated. Saliva production peaks when you are standing or laying down. The bicarbonate component in saliva buffers and protects teeth from being eroded by dietary acids. Saliva also contains fluoride. One study showed that fluoride mouthrinse or toothpaste increased the fluoride concentration in saliva significantly more than a fluoride lozenge or chewing gum.