There are three salivary glands: the submandibular (under the jawbone) and a parotid gland in each cheek. Removal of a single gland will not decrease saliva by much.
http://www.wikisurgery.com/index.php?title=Submandibular-salivary-glan d-removal-PatientIinformation
http://www.healthatoz.com/healthatoz/Atoz/common/standard/transform.js p?requestURI=/healthatoz/Atoz/ency/parotidectomy.jsp

