One could argue that its pretty silly that we still *have* to brush our teeth at all, why don't we have some nano-tech gadget that you put in the mouth it triggers, and 1 second later all bacteria and other stuff from your teeth and mouth are gone.
Now how awesome would that be? ;P Heck it could even be built so that its energy source *ARE* the bacteria in your mouth.
.. ehm sorry, what was this topic about?
And even better, one could integrate that directly into an tooth. Lifelong clean and perfect teeth.... If only the future was here, now.