The instructions for the flouride treatment vary but the stuff I use says 5 minutes, max. I had a dental oncologist and my personal dentists son had just completed dental school at UCLA where they have a special course for xerostomia and oral cancer patient treatment issues.

Gary Allsebrook
***********************************
Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
________________________________________________________
"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)