These worked great! Both the heavy duty and regular, fit my top and bottom teeth;but you only need to use 1 at a time. I’m so grateful because I have a deep bite/ overbite (I need braces), but they still fit over my teeth perfectly! Applying to the top teeth meant my lips didn’t fully touch/close in the middle, but it didn’t make me a mouth breather. Applying to the bottom teeth, I could close my mouth all the way, as normal.

They don’t come out when I’m sleeping! I grind/ clench my teeth in my sleep and have unsuccessfully used mouth guards in the past. They were all smaller in length (height between top/middle of gums and bottom of teeth). So they’d come out my mouth while sleeping and I’d wake up with it next to me. Also I chewed through a few within a month. So this is a lifesaver! seriously I’m so happy it fits.