johnd,
0.05 % fluoride should be used once a day. I think any more use than that would have and insignificant advantage as the research already states that that is the best for protection.
Cheers,
Mike

Thanks Dr Mike.

My "radiation dentist" (recommended by Georgetown CCC) points out that his TV and movie clients with all caps etc, also need to use the flouride trays for life, so we are in good company . Plus we are all having "youth" problems,as our risk of decay and caries is closer to children and teenagers than seniors, so we need our flouride
I was also told to use the trays without any flouride for each RT since I had so many metal fillings that the "scatter" would have burned my tongue and mouth even more. I could not deal with the flouride many nights during treatment due to having to rinse the mucous before sleep (and every two hours during the night) but use it regularly now.