not qualified and in any case, not sure our dreams have any deep meaning, beyond what we can easily see by reflecting for a while on the literal content, which reflects our brain activity in its most literal mode. however, I’ll join in the fun. just keep retelling the dream and its elements to yourself, exactly as you can remember it, but out loud because that is how the meaningful words will come back to you. for instance, is there a situation in waking life you have to “sink your teeth into” yet where you fear you don’t have the strength or ability to give a good effort? Are you “toothless” in face of a threat, like an old watchdog? I think other posters are right on that in general it may reflect a general concern about the state of your health, or about signs of aging.