As far as the tooth dream goes, I too have had a variation of it, with anxiety over an abnormal tooth ending in removal of said tooth, but only, as was mentioned by others, after I had experienced chipping a tooth during an ordinary activity.
As for interpretation of dreams, we must remember that our memory of a dream is no more reliable than our memory of a waking event. Indeed, it can be argued that is much less reliable. Adding to the inherant unreliability is the natural human impulse to assign a narrative to any given series of events, even if the events were not causally related.
I'm wondering if anyone else has had my experience of a dream in which I am frustratingly less mobile than normal. It seems to be a kind of analouge to sleep paralysis, only it affects my dream state instead of my waking one. As an example, I often have dreams of running away from something, and I find that I just can't make my legs move as fast as I think they should. I almost always find them slowing to a stop just as I am about to wake up (at least, I don't remember any dreams that come closer to my awakening). The other example is a dream where I can't open my eyes more than a slit, or move my head to see something. It is a very physical feeling, as of my muscles tightening without moving, not simply an inability to control my motions.