4. Keeping Products Too Long

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Using expired makeup may not seem like a big deal but it truly is. The antibacterial agents in makeup start to break down over time, which means bacteria has a solid place to grow. Think acne, skin lesions, rashes and pink eye. Not cool! If you're makeup has been around for more than a few months, it might be time to toss it.

Sharing Mascara or Eyeliner
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