In a new video, Lifehacker teaches you what causes bad breath and how to stop it.

“Why, it’s simple,” you may announce upon reading the above sentence, smugly reclining in your seat before letting out some lofty cackle, “just brush your teeth and don’t eat garlic!”

Got news for you, buddy: It’s more than that. And you better not still be doing that whole breathe-into-your-hand move to check either, because, as the video points out, that gesture’s pretty much just a myth created by the media.

Get educated. Stay fresh.