There's nothing more metal than brushing your teeth. Good oral hygiene is about as metal as it can get. Wait, what? I know you're thinking "he can't be serious." Okay so brushing your teeth isn't that metal, but it could be. Check out this hilarious over dub of the Tooth Tunes commercial using Meshuggah! Now I could get into this, hell I'd never quit brushing. Metalheads could use their own Tooth Tunes brushes, just sayin'.