Yeah, silly me Velvet. After reading your assurance that bettas have their mouth partway open, I ran and checked all mine. It's true but it's barely noticeable; two of my bettas are marbles and have different colored splotches in their head area so it's hard to notice. The one that I was concerned about does have a larger part in his mouth than the others but since he's eating and acting well, I'm not worrying about it.
You try to pay close attention to your little guys and then once in a while, I guess you notice something different to you that's actually pretty normal! Does anyone actually take their fish to the vet? Not that it sounds ridiculous to me, but I haven't heard of such. Wouldn't that be sad, me urgently dashing to the vet's with my little bagged betta imploring the vet to do something? If something was lodged in my betta's mouth and I had to get it out, I'd be afraid of causing him more harm by the physical handling- maybe koi, but bettas are so small that if it came to that, I'd just go sniffling to the vet's while the people there waiting with their dogs and cats look at me funny!