There's something called... "Oil Pulling" to help clean teeth.
  It's an ancient practice. Usually it's Olive Oil, but I'm sure
  any small-molecule oil would work. Fish oil is also a
  small-molecule oil.

  You could probably use mineral oil as well. All equally small
  molecule. [I wouldn't swallow the mineral oil necessarily but
  then again, if you've used it to clean your teeth, you probably
  want to spit ANY oil out anyway).

  I've tried it before; might try it again.

  Oh I have some article somewhere about tooth remineralization
  using breathing - lemme see if I can find it...