There are a multitude of reasons why women keep certain beauty products as long as they do – maybe you can’t justify throwing out a pan of shadow that is still partially filled with pigment or your favorite lip gloss shade has been discontinued and this is the last tube you have.

But while these may seem like completely logical explanations, holding onto cosmetics for too long may be hazardous to your health.

According to the Daily Express, a new study revealed that 15 percent of cosmetics buyers aren’t aware that beauty products have expiration dates. Furthermore, 66 percent continue to use expired products regardless of possible health concerns.

“Continued use of a spoiled product could lead to skin irritations or even infections in broken or sensitive skin,” Dr Chris Flower, director general of the Cosmetic Toiletry and Perfumery Association, told the news source. “Cosmetics are made to resist everyday exposure to micro-organisms for long enough to ensure the consumer can finish using the product safely.”

Generally, the news provider reports that mascara should be replaced every four to six months while lipstick, blush and eyeshadow can last up to two years.

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