Glad you were able to form it to a better fit! I have a dentist-made one for my lower jaw (I think dental insurance didn't cover it, something like $300 ten-ish years ago) because I couldn't get the OTC one to work at all. Over time I've learned to breathe during sleep with my mouth slightly open, more relaxed. I bet this means I snore, alas, but the dentist said it's the desired outcome from a jaw-hinge and tooth-surface perspective.