OK, so my FIL finished all his treatments last year end of october. A few months after this he has developed dry mouth...and now he is unable to eat dry food without sipping water. It doesn't seem to be improving.
I know this is due to his IMRT which partially involved his parotids (salivary glands).

WHat I would like clarification on, since I have received a mixture of answers abou this topic, is whether we can expect him to improve since it has now been about ten months since he completed his IMRT and he has not improved at all.

I will note for passersby that his taste returned completely after a few months.

I know you guys have personal experiences to share, and those are very welcomed, but I would also love any statistical data or articles that give me a general idea of what my FIL's odds are.

Info about my FIL: He has been tumor free since his treatment and I have him on 1/2 cup dried goji berry and 5 grams of spirulina daily and a supplemental and anti-oxidant nutritional therapy. His next PET is spet 8th.

Thanks guys, and hugs to all.