Have started radiation to T2N2Mo scc base of tongue, am in seventh week of chemo, post left neck disection. I hade all my dental work done,couple of crowns, 4 extractions, doing well. Dentist gave me trays for flouride treatment, told me to use them all night. (appears,on line most recomendations are for 10-45 min.)I can stand it only for about 3 hrs. then start to have tooth pain and bleeding gums. Plan to see oral surgeon later today. Tolerating other stuff well. Any great experance out there? Edd