As for the TMJ it’s something I’ve felt with since a kid, no I have never been a gum chewer, got turned off by how hard bazooka Joe was as a kid in the 80s. I bite through mouth guards but the main issue is when nervous I press my tongue into the roof of my mouth which puts a load of stress on the TMJ. The occipital plate and neck are for migraines I’ve also suffered from since a kid. It went real well, he also put a bunch in my traps to help them settle down, I have notoriously tight traps.