From lipstick to mascara, find out exactly when you should be replacing your favorite cosmetic items.
The reason: Powders, since they don't contain oils and water, have a longer shelf life than most other cosmetics. As a rule of thumb, toss these when the color darkens or starts to cake up. And while these products aren't as succeptible to bacteria build up, be sure to wash your brushes frequently (try this DIY brush cleaner) to keep them clean.
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