What it boils down to is that this type of dream is an anxiety dream.
We concern ourselves so much with our outward appearances, that when you think of it, our teeth are not only indicators of our moods (smile / anger / fear / etc.) to those around us, but also are what we use to eat with, and they lend a unique "timbre" or "resonance" to our voices.
Add the fear of losing one's teeth (be it in a dream or in reality) and you'll begin to see why this particular type of dream manifests itself during times of acute stress that we may or may not know the source of.
This type of dream is akin to a metaphorical "pressure release valve" in that your subconsious is trying to make heads or tails of your supressed thoughts and emotions.
So if and when you do experience this type of dream, do a little bit of candid soul searching and attempt to pin down just what may be bothering you.
Take care,
-vertebrae-
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