I used to do this. I'd really rip into it and bite the thing off though, none of this slowly 'prying' it off crap. Dentists are very expensive these days and I have a family to feed so no more biting caps off for me. I once bit one off then found out it was a screwtop. Dickhead :mellow:
I use the ring my wife gave me for our engagement. It's not one of those special bottle opener rings, but the same principle. It's chipped as feck from bottles over the years and I can only imagine how the enamel in teeth cop it!