All glands that secrete their products into the oral cavity are called the salivary glands. There are two groups; the first is formed of numerous, small, mucosal or submucosal glands, with short excretory ducts. They are classified according to their location into labial, zygomatic, palatine and lingual. The second group is made up of large glands with longer excretory ducts. They are paired and symmetrical, distributed along the body and ramus of the mandible. This group includes the parotid, submandibular and sublingual glands. The principal function of the saliva is to protect the oral cavity, although it also has digestive functions (3)(6).