Next time you’re brushing your teeth, try holding your hand still and moving your head instead. It helps if you get some good nodding music playing in the background; I suggest ‘Here Comes Your Man’ by The Pixies (UK link US link) but most things would probably work.
For bonus points you could also try using your non-favoured hand to hold the brush.
Go on, try it!
In other news, http://www.StickScene.com is nearing 350 puzzles now. Go play!