Oh man, I constantly get the teeth falling out dream. Then halfway through the dream it occurs to me to wonder: Hey, I dream this a lot. Is this one actually real?
Inevitably in the dream I decide that OMG this one is real and yes, I really am spitting out tiny fragments of tooth all over the place. Actually really waking up is always a huge relief. Note: If you have this dream a lot, do not read a book called The Radium Girls, about working women who got radiation poisoning at work. Reading this did not reduce the incidence of the tooth dream at all.
A couple of weeks ago I woke up and there was for real, in real life, a big chip off my front tooth, and boy did that freak me out. (It being boring old real life though, I just went and got it fixed the next week.)