Dreams to Nightmares. in Feeling low

So I usually dream some big elaborate dream each night of some weird shit, but over the last couple of years I’ve had these nightmares come every few months of my teeth breaking apart and falling out of my mouth, it always feels so realistic that when I wake up I have to rub my jaws just to make sure I’m OK, I’ll also have a lingering feeling for a short while after I wake up as if teeth are actually missing.. Can anybody enlighten me as to why this might be, is there some subconscious trying to talk to me through the dreams?