Why do common household items (shampoo, toothpaste, medicine, etc.) have expiration dates and what happens once the expiration date passes?
In: Other
As others have mentioned, sometimes these things can separate with time and become less effective, although re-mixing them will tend to solve this issue. Mostly, it’s a marketing thing. Companies want stores and consumers to keep buying steadily, and so putting an expiration date on the thing pretty much guarantees that your drugstore/grocery store will have to order new product even if they don’t sell out of the last batch (would you buy an item past an expiration date even now that you know it’s often a meaningless number? Yeah, me neither).
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