Andrew
You may want to ask your dentist about keeping the flouride trays in during radiation. My ENT and the CCC team insisted I see a specialist dentist prior to treatment who has had lots of experience treating radiation damage and Post treatment issues. While he gave me the all clear, his suggestion was to ALWAYS wear the trays during radiation since I had so many fillings and the "scatter" effect would otherwise end up with additional damage to my gums and mouth. Made sense to me since the CAT scan that first caught the tumor had radiologist notes that ".. extent of this lesion is difficult to discern secondary to streak artifact from the patient's dental fillings..." Made the mask a tad more smug, but strangely provided a psychological boost like putting in the mouthgard before sparring practice. Like David, food particles were not an issue for me at all but that's because I soon was living just on Ensure Plus which left no debris.