Well you have the device i was refering to. The trick that doctors tell patients is to do it right from day one of treatment. Too many of them only mention it in passing and do not weekly check your range of motion to confirm you are not slacking off during treatment. Scar tissue forms in the muscles during the radiation process, between the long fibres of the muscle. The trick is to catch this early so that it never has a chance to become so thick that it dominates the movement of the muscle. Doing this after treatment dosen't usually have great results, but will only help a little. By then you are asking too much of the muscles to overcome this non elastic material within them. Sorry, thought I had an easy fix to your problem.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.