Mine is tiny and clicks onto my front teeth. I got it to cut down on clenching and grinding. Grinding is obvious because the teeth can’t touch, but the clench is more interesting. By putting a small gap in there the muscles can’t clamp down fully – try it: bite down naturally and then clench. You can feel it up the side of your head. Now, put a pen/pencil/? between your front teeth and slowly bare down. You should notice that those side muscles can never fully engage.
It took some getting used to, but my morning migraines vanished.
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