Salivary gland cancer is very few. Salivary glands have two different types, and these are the major salivary glands, which consist of the parotid (located at the preauricular area). Submandibular glands (located underneath the mandible) and the sublingual glands. Minor glands are scattered all over the mouth and serve to lubricate and produce saliva that aids in the digestion and deglutition.