dental dreams for me:

It maybe you have grind issues (grinding teeth while sleeping) your dental dreams might from your physical happening while asleep ( grinding teeth ) it might feel your hurt, that is why your having dental dreams, sometime, dreams can relate on what is currently happening while sleeping.

Ex: I got a dream that somebody punched me in the head, knowingly when I woke up, my wife told me that when I turn to one side, I bumped my head on the wall.

Hope this helps.