The Hidden Truth About Expired Products You Must Know

2. Hairspray

Expires in: 18 months (opened), 3 years (unopened) Average Cost per Bottle: $2–$20* Hairspray's expiration timeline depends entirely on whether you've opened the bottle. Unopened bottles maintain potency for three full years, while opened containers typically deteriorate within 18 months. Always examine the label for precise specifications.

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©stockfour/Shutterstock/HHairspray Extreme temperature fluctuations dramatically impact spray performance. When the scent intensifies unusually or holding power weakens, replacement becomes essential.