Expired Goods: Crucial Facts You Should Never Ignore

2. Hairspray

Expires in: about 18 months once opened, up to 3 years unopened Average cost per bottle: $2–$20* Pressurized hair lacquer delivers hold by coating strands with flexible polymers, yet those polymers degrade when air, heat, or humidity slip into the can.

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© stockfour/Shutterstock/ Hairspray If a quick spritz smells harsh, feels sticky, or leaves hair limp, the formula has oxidized. Recycle the can and pick up a fresh one to keep your style intact from dawn to dance floor.