How long have you had that mascara? Too long.

This is exactly how long you should be keeping every beauty product you own.

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Honestly ask yourself: Have you consistently added to your makeup collection for years, hardly throwing anything out?

It happens to the best of us.

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Have you built your nail polish stash to include every color and shade under the sun, hardly using most of the colors in your arsenal?

It takes time and dedication to cover all your color bases.

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If you've answered yes to any or all of these questions, it's time for a change. All the makeup you've had laying around for years can actually ruin your skin.

"Skin absorbs everything you put on it. Using expired makeup is like eating food that has turned. While it may not make you as ill, it can cause all kinds of problems from inflammation to rashes and to allergic reactions that can be really severe," celebrity makeup artist Tamah from The Wall Group, tells BuzzFeed Life.

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