Always involving a car..

I seem to have recurring dreams involving cars. The first I ever had was a driving one where I was with my boyfriend and we drove over a bridge and all of a sudden headed for the ground. We crashed and ran out and just grabbed each other asking if each other was OK. That one I've had 3 times.
Another I've had is where we were in a car and driving when all of a sudden we hit sand on a beach and headed for water. I asked what he was doing and he didn't answer. We drove upon a wave and were lifted up with the top of the wave, then he said "the wave fell upon us," I kept asking what to do "should we jump out? What should we do?" And he never said a word. After that, I awoke.
Also.. many dreams about teeth. Teeth falling out or teeth that are too big.
Thank you for your help, everyone (: