seems to work
I clench my jaw and grind my teeth-24/7.  Have tried every mouth guard out there, with little relief.  Used this for about 1/2 hour last night, and when I took it out, jaw was in a "neutral" position.  When I tried to clench my jaw, it wouldn't close that tight.  No headache this morning.  Will use it more, and update my review
Rating: 5 stars