"I do too" answers come alot around here. We all have PTSD, or care about someone who has it, or both, and it seems that we all share alot of other life experiences.

Stress causes jaw clenching, and PTSD is stressful, so that makes sense.

Yeah, if you want to call your dental insurance company to find out if a nightguard is covered, the diagnosis is "bruxism" which means grinding. Go get it as soon as you can. It will save your enamel, and your jaw joints. Yes, $400US is alot for a piece of rubber.

I had to wear it in my mouth through the airport security when I travelled, because of the liquids rule, (you have to keep the nightguard in water) then we ate a bite at a restaurant in the airport, so I removed the nightguard and put it in my napkin, which I threw away...

Mine fits on my upper teeth, but they do make them for lower teeth. I love mine, and now I can't sleep without it. It's just a thin piece of rubber similar to what boxers wear while boxing; it does not keep your teeth too- too far apart. It's comfortable. You can still talk with it on, but you sound funny. If it fits right, it will not hurt your gumline.

TMJ is TemproMandibularJaw I think, (correct me, somebody,) and you can read all about it online away from this website here. It is a constant pain in the jaw muscles caused by grinding and tension and overuse of the jaw muscle. It can cause your jaws to subluxate (attempt to dislocate) and dislocate completely if severe. Very Painful! The jaw clicks when you chew. It can make you think you have an earache when you really don't because the pain is severest right there where the lower jaw connects to your skull, near your ears. (Go feel for it.) Right there.