Does shampoo or conditioner expire or go bad? Personal care products do expire, and using bad hair care products can damage your scalp and create more harm than good. The rule of thumb is any unopened bottles can last for around three years, and any bottle that's been used has a shelf life of 1 1/2 years. If you buy hair-care products on sale or in bulk or hoard small bottles from hotel rooms, keep this timeline in mind.
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