Thank you for your comments. We were told by one therapist that if he didn't swallow soon, he'd forget how. But the copious mucus and phlegm that led to terrible coughing fits prohibited him from doing the exercises as frequently as they wanted. The last therapist we saw seemed more reasonable and understood and said just do what you can but keep trying. And if the exercises sent him into a coughing fit, just stop for a while and do what we can, even if it's only once a day.