From lipstick to mascara, find out exactly when you should be replacing your favorite cosmetic items.
The reason: If you have concealer in a pan (like the one pictured), it can last up to 18 months if you apply it wth a regularly-washed brush or sponge. If you apply with your fingers, though, you're more likely to transfer bacteria. If you have concealer in a tube with a wand you'll only want to keep it in your makeup bag for a year before it starts to turn.
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