Has he said anything about not being able to get anything down? You can start by giving him two of three teaspoons of coffee/tea. Then see how it goes. Sometimes after a couple of days, what he has drunk may come back up -- that would be a sign he cannot yet swallow. It could be a matter of confidence or it could be the scarring in the throat as a result of the radiation is now making swallowing difficult. It could also be the area in the throat is still swollen from the radiation e.g. the epiglottis). Sometimes doctors will say "The best way to improve your swallowing is by swallowing everyday." But this is not necessarily true. Your husband may need a barium swallowing test which will show on x Ray what happens when he attempts to swallow. That's the only way to know for sure.

Whatever the case may be, make sure he does his swallowing exercises every day. Mother will keep his swallowing muscles in shape.