Stretching is slow process and there are a couple of different devices to help extend the range of motion, that you can ask people about here that have actually tried them. Like all muscular stretching, it is pushing the muscle to its limits over and over again, and not something that is done at one "under sedation" kinda thing. That is a surgical intervention that only a couple of people I know have had with some improvement and significant discomfort. I would go with the several months of stretching multiple times a day first to see what can be improved first. Other here have limited range of motion and I hope that they will join in the thread.

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.