You should replace your underwear every year. But if your underwear has holes, stains, busted seams, or a worn-out waistband, it’s time to swamp them out ASAP.
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FAQ - Party In My Pants
How Often to Replace Underwear
This is how often you should actually replace your underwear
How often should you replace your underwear?
Half of people don't change their underwear every day, shocking