Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't just protect your teeth, protect your jaw

I tried an off the shelf mouthpiece. Then I tried a $400 custom made mouthpiece from the dentist (he claimed since it was hard I wouldn't chew and grind so much) but ANYTHING in my mouth made me chew harder. Now I'm using a biofeedback device that is a headband -- it's not in my mouth. It hasn't "cured" me -- if I quit wearing it for a few nights I start grinding again, but I feel much better in the morning when I wear it -- my jaw doesn't hurt.