Most pillows should be replaced every 2-3 years. However, some pillows types can last as long as 5-10 years. Check your pillow here.
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Mattress Guides & Sleep Education - NapLab
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How Often Should You Replace Your Pillows?
Pillows BedInABox
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The NAP Lab
Mattress Guides & Sleep Education - NapLab
NapLab - Objective, Data-Driven Mattress Reviews
Pillows BedInABox
Do Pillows Expire?