All patient will be treated under general anaesthesia An appropriate gland-preserving minimally-invasive surgical procedure will be performed for all patients according to the nature and extent of the disease for either submandibular or parotid ducts.

Minimally invasive techniques for ductal salivary gland pathologies include:

1. Sialolithotomy through a simple cutdown
2. Sialendoscopy
3. Transoral microscopic-assisted sialolithotomy.

This was done using a questionnaire to measure salivary score (this questionnaire is formulated by the multidisciplinary salivary gland society "MSGS"). The questionnaire consists of 20 questions divided in two groups: 13 regarding xerostomia and 7 regarding sialadenitis. Each question is scored from 0 to 10 and the total score could vary from 0 to 200 points.

We have chosen 6 minutes as our standard time to collect saliva and we have chosen on purpose to collect saliva separately from the two parotids and jointly from the submandibular gland. A 5cmx5cm gaze is applied on the papilla of each Stenson duct and a third one is placed under the tongue. All these tampons are weighted separately after 6 minutes and the results collected.