I had my upper done 12 yrs ago and it has been fine- broke a couple of times but they fixed it, no cost. Dentists are expensive and these guys are too, but no one does what they do and if you teeth really are f'ed up they are a lifesaver. Came back to do the lowers, going fine. I hear the horror stories and truly sympathize, every surgery involves some risk and uncertain outcomes, and recovery may differ.