Hmm, sounds like either way, it might be uncomfortable. Maybe I'll just go with the £30-ish Boots DIY one. Or at least try it first and see how it goes.
I never really noticed it myself, but my dentist brought it up. I guess it's quite significant when it can get noticed upon checkup. When I mentioned it to DH, he said it's really obvious when I'm asleep and he's awake, and he thought I had known.