This may answer your question. I have just come across this leaflet from the UK Oxford Centre for Head and Neck Oncology on management of dry mouth after cancer treatment. They recommend saline solution mouthwashes as a saliva stimylant, http://www.oxfordradcliffe.nhs.uk/forpatients/090427patientinfoleaflets/101028soremouth.pdf

They also mention BioXtra gel, which I have just tried as a replacement for Biotene which is not available in the UK at the moment. It seems much better then Biotene which i find stings a bit.

Sally

Dx 10/11 51yrs LBOT Stage 4 2nodes HPV16+. Non-smoker mod alcohol.
10/11 Induction chemox2 (Docetaxel, 5-Flu, Cisplatin) then Cisplatinx2 IMRTx30. Ended 01/13/12.
12/07/11 RIG. RIG removed 05/05/12.
4/12 CT scan clear. Visual scope checks clear as of 10/13. Learning to live with eating challenges.