Echoing what others have said. I lost 2 salivary glands removed during bilateral neck dissection (they were not malignant), and have the normal sequelae from radiation, etc. I have some saliva back, but not a ton. I can eat pretty darn well most of the time, but have to watch my caffeine intake, as I note that too much coffee or soda with caffeine will dry me up in a hearbeat.

Biotene products are great, and just drink lots and lots of water. It does help.