Dj
Some of the things you are going to need.

Pure Aloe to swish in mouth daily.
Gail is the expert on this.

Biotene mouthwash and toothpaste.

Biafine for use on the outside of the neck, daily from the start of radiation. Prescription.

Magic Mouthwash,numbs the mouth long enough for him to eat. Prescription.

Guifesine to make the mouth gunk a bit more liquid.

I should tell you that these are items we needed when conventional radiation was done.
As you go along and the final decisions are made you will be able to get more advice from those who are familiar with your particular treatment protocol.

Take Care
Marica