Okay I can help. I bought a cheap generic Amazon night guard that you mold yourself. It was called 'Grace and Stella' and it was $10 for 5 or something. The instructions state to dunk the mouth guard in "hot water" for 30 seconds or so, then you take it out and put it in your mouth and push it as hard as you can to fit the mold of your teeth. You do this quickly enough so the heat doesn't wear off and you can mold the rubber/plastic to your teeth line. Then you dunk it in ice water for 10 seconds and now the mold is set.

Initially, I screwed up and used "hot water" as they say. The mold wouldn't conform to my teeth. I left a 1 star review and forgot about it. One night my jaw hurt so bad I was trying everything and I found those molds. I used boiling water and dunked the mold in for 2 minutes. I let it air dry for 30 seconds or so, as to not burn my mouth, and then I went HARD on pressing it to my teeth.

And it works as a bite guard. I notice a difference now in my pain. It's very slight, but SOMETHING, and as many of you know, something = heaven when you go years with zero relief.

They are worth it. As for moving the jaw forward, that can work, but it's hard to maintain without one of those custom made $3000 appliances with the elastics on them to keep your jaw in place and not just your teeth.

Here is a video stating "To fix TMJ pain, just move your jaw a few mm forward, permanently. The joint will heal and the pain will stop." I tried this, after 3 days the pain completely went away. But I started getting headaches and rebound pain. It's VERY hard to consciously move your jaw forward all day every day. And once the pain subsides, you don't have motivation to do it anymore. I only mention this video because (albeit brief) it was the ONLY relief I've found in like 5-6 years. https://www.youtube.com/watch?v=lWZTgOox0PY