In reply to Jenny C:
> Seen someone loose a front tooth at the climbing wall same way (slack in teeth, fell off, tooth pulled out) - slip late (so don't need to pull up masses of slack, or if you must hold extra use your lips.
I think it must be reasonably common, I know somebody who's done the same.
I'm not sure if putting the rope between your lips is such a great idea, wouldn't you just end up biting through your lips?!
Personally I just make sure I open my mouth!