Dang it, buzzfeed, quit telling people that nail polish expires! It does NOT. If your nail polish gets thick or gloopy you can add nail polish thinner (NOT acetone or remover) to bring it back to like-new. The solvents in polish make it an inhospitable environment for bacteria and fungus, so they do not live in the bottles. That’s how nail salons are able to use the same bottles for multiple customers. Please, don’t throw out your polish!