Here’s What the Gross Bacteria on Your Expired Makeup Really Looks Like – Glamour

In case you’re not sure how to tell when a beauty product expires, there’s a few things to keep in mind. As a rule of thumb, mascara expires after three months. And when in doubt, products have a little indicator on their packaging that you might’ve missed. It looks like a little jar with a number inside, which denotes the number of months you have after opening it until it goes bad.