I got a night guard. The mold was taken wrong. Every time I wore it at night it would shift my teeth a little temporarily and my bite would be off for several hours after I work up, like half the day... Went to the same dentist that made it for me and he just kept trying to adjust my bite and drilling instead of making a new mold. I finally got upset at them and they are making me a new one. These guys are usually morons.