In a world of endless YouTube tutorials, celebrity-endorsed lip kits, and candy-colored shimmers and sheens as far as the eye can see, makeup has never felt more glamorous, accessible ... or prone to improper use and bacterial overgrowth? OK, so it's the less-than-sexy secret no one likes to talk about, but it's true: Cosmetics can go from super sexy to straight-up disgusting really quick if you're not swapping out your old Sephora finds for fresh products on the regular.
It may be the last thing you look for when you're scrutinizing the label of a foundation, gloss or shadow, but many makeup products have best-used-by dates. And if you swear up and down you've never seen one, you probably haven't: According to the U.S. Food and Drug Administration, cosmetics manufacturers aren't required by law to provide those dates. But even in the absence of printed expiration dates, your cosmetics do have a shelf life. So while concealing your dark circles may get you carded at the bar, you can't cheat time when it comes to your beauty arsenal.
We asked Los Angeles-based makeup artist Allie Renee to break down the do's, don'ts and oh-my-god-seriously-don'ts of makeup hygiene so you can clean out your makeup bags and avoid any nasty beauty blunders.