Try not to cough while brushing your teeth; it just goes all over your sink and clothes… the back of your hands. You know what? Just don’t even bother brushing your teeth at all anymore. And don’t eat either, so not brushing your teeth isn’t a big deal; this applies to drinking too. While you’re at it, give up sleeping as well. When you sleep, your mouth dries out, allowing bacteria to grow in abundance. But don’t breathe exclusively through your nose, as bacteria grows in saliva too. Your best bet is to breathe however you normally would and spit often. But not too much! That’s just unsanitary and you should be ashamed.