You probably know this already, but sharing mascaras is very unhygienic. Here's why: Since mascara feathers attract bacteria when they come in contact with our lashes and then those germs are pushed back into the bottle, makeup pros often swear by disposable wands. That means you can never borrow mascara even for finishing touches.
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Pressed Powder
Pressed powders are also not safe to share. A lot of people believe that only wet products are potentially contaminable, but pressed powders and minerals, even pressed eyeshadows, can transmit germs, especially if you are using the same puff or brush. Foundations that come in pumps are much safer.
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Brushes
Sharing your makeup brushes or blenders is a bad idea, too. Using someone else's brush can be particularly rough on your skin and if you make a habit of sharing, your existing skin conditions can get worse. Even if you are using your own brushes, you need to freshen them up after you use them to keep the bacteria away.
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Lipstick
Be selfish about your lip glosses and lipsticks — you have good reason to be. Glosses, especially, harbor bacteria and they travel faster thanks to the wet formulas.
