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You'll likely use it up before it does, but ChapStick only lasts for two to three years. If you find an old tube and wonder if it's safe to use, be sure it doesn’t look or smell funny. "It's possible that bacteria and fungus can grow on old lip balm," says Anthony Youn, M.D., a surgeon practicing in Detroit.
The popular lip balm has some surprising secrets!
Learn the truth and 4 other things you never knew about the popular lip balm.
5 Things You Never Knew About ChapStick