Salivary glands are classified in two groups as major and minor glands. At the both sides, the parotid salivary glands (in front of and below the ear); the submandibular salivary glands (below the lower jaw); and the sublingual salivary glands (under the tongue) are major salivary glands. There are many minor salivary glands in the mouth, lips and palate. The function of the salivary glands is to produce saliva, a watery substance that moisturizes the mouth, shows a disinfectant effect against germs and contains proteins called ‘digestive enzymes’. Through the major and minor glands, 0.5 to 1.5 liters of saliva per day is produced and discharged into the mouth.