I wanted to let you know from my own personal experience, that biting down hard on your teeth at night can cause extreme pain in the jaw line. It happened to me.
I used the garlic protocol which helped tremendously and was also dirt cheap but I still went to the dentist for an X-ray and he told me there was no cause for that kind of pain. He told me to stop gnashing or biting my teeth at night and see if the pain subsides.
At night, I positioned myself with my head raised and slept on my back. The pain is no longer there. I put so much pressure on my teeth which caused the excruciating pain in my jaw line.
I would still do the suggestions offered in this thread but also try to make sure you are not putting any pressure on your teeth at night.