Dreams where your teeth fall out

I had a dream where i was standing naked in an empty space
and anywhere where i had been touched by another person was marked, it was dirty, there were black fingerprints all over me.

i couldn't wash it off.

Than i checked my mouth. My teeth - they were all dirty in the same way. I tried to rub it off, and then i started pulling out my teeth, one by one, and laying them in patterns on the black, empty floor of the black empty space. I didn't stop until they were all gone. They were covered with marks. I arranged and rearranged them but didn't get anything out of it. I believe in my dream i could taste the blood, but not feel the pain.

Expository note: this was during my freshman year at Bard when i learned that it wasn't safe to go walking alone at night because there was a serial rapist in the woods. This stirred up some bad stuff.

In adults, losing teeth is an unmistakable sign of bad health. General access to dentistry has reduced the frequency with which we experience it, but in the same way that our bodies instinctively know that smooth skin is healthier than zits and abcesses, they know that if you're losing your teeth, something is very, very wrong. We explicitly connect toothlessness with powerlessness, both in expressions like "has no teeth" and in the fact that only very old people are generally seen going without. The tooth dream - stress connection seems reasonable to me, since long-term stress is associated with poor health and risk of illness. Without having to unduly anthropomorphize the subconscious, I think it's reasonable to suggest that we might view failing health through this instinctual lens.

I've heard that people with eating disorders frequently have tooth dreams. This is consistent with the ideas above, even for ego-syntonic disorders like anorexia nervosa. You might have a social/moral/virtue framework that makes starvation desirable, but that's not going to be able to undo the genetic programming that's causing some parts of your brain to say "panic!" Among people who purge, of course, the teeth really are at immediate risk. I don't know whether we make the vomiting - tooth damage connection instinctively, but there's a good chance that someone has explicitly attempted to put the fear of god into the subject about tooth loss. Add this to the fact that people who purge usually have bulimia, which is more often ego-dystonic, and it makes sense that they will have bad dreams more directly related to a real feared consequence.
Note: This is not to imply that people who have tooth dreams are likely to have an eating disorder as well! Rather, this association provides a field in which to test the suggestions I made in the first paragraph.

Finally, did you ever stop to think about how damn weird teeth are? I mean, you're this squishy, watery thing, and yet you've got these hard, white bits inside your head! What the devil are they doing there? The whole inside of your mouth is pretty crazy, come to think of it. Tongue?

In the Tractate Brachot of the Babylonian Talmud it states that a dream where your front and back teeth fall out portends that your children will die.

This has to be taken in the context of that particular passage of the Talmud which is discussing dreams and their interpretation. In this context there are two important things to note:

1. That dreams are meant to displace punishment, ie. in a dream you live through the horror of the experience so that you don't have to be punished in the waking world.
2. After the age of 22, good dreams are actually bad omens, and you are expected to have only bad dreams.

The Talmud also mentions here that one who doesn't experience any bad dreams over more than two years is in dire straights because it signifies that God is no longer punishing you in this world but is reserving your punishment till after you die. (The Midrash(I think, though I cannot recall the source) discusses how Abraham chose to have his descendants suffer for 400 years in this world because the sum total of that suffering would be less than one moments' suffering if the punishment was administered in the afterlife.)