Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not that great

I had another that was perfect but my dog got to it and thus had to find a replacement. (I know... enter joke here. :) ) This one works fine, but the thickness keeps my lips open and not the most beautiful if you are not sleeping by yourself. I found the seams a bit rough, which you have to sand down... It just is bulky in the mouth, even though, yes, it protects your teeth from grinding. There are better profiles out there...