Ah. I hadn't thought of that possibility, but now you suggest it, it's obviously true, and entirely plausible. Plus, failing the brush the teeth regularly is, of course, a key symptom of someone who's about to turn to the Dark Side and become an evil genius. It's up there with the glowing red eyes and the tendency to cackle evilly at the drop of a hat. Anakin never brushed his teeth in Episode 3. Smeagol only turned into Gollum when he stopped brushing his teeth regularly. So there you have it.