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In my case it was prophecy. The meds I'm on coupled with genetically disposed towards soft teeth have led me to having my teeth literally rot and fall out. They are literally aiding my demise! (Finally this year I get my annuity so I can afford a new smile and to carve out the rot!)
I'm sure the anxiety thing and changing of ones life path also have a part to play...*sigh*
Sounds like a lot of focus on your teeth. I would certainly expect that to be reflected in some of your dream content.
Oh yeah I forgot to mention that another due said that he would have that kind of dream when he was with his ex-girl friend who drove him crazy. So I guess if you are around people who drive you nuts or make you feel anxious then that might also be a cause.