Besides, if you really loved it that much, you'd have used it up by now. That dollop of frizz-fighting conditioner looks separated or curdled? To the trash! And anything that you've been hanging on to for more than three years (like that one shampoo that's been lingering in your old bathroom at your parents' house since high school) is better off headed for the eternal medicine cabinet in the sky. Texturizing spray taken on a funky smell? Toss it. Many of the same guidelines for figuring out the freshness of your makeup and skin-care products carry over to their hair-loving counterparts. How else can you tell if a hair product has expired? "Usually, unopened products can last three years, and once opened, one year," King says, so you may want to make note of the first time you used your chosen product. Once you have that information, you can make an educated guess regarding how long to hold onto or use the hair product in question. "When in doubt, there is a batch code on every product, usually on the bottom of the package, which consumers can call to ask the company when the product was manufactured," cosmetic chemist Ginger King tells Allure. No PAO mark on your favorite shine serum? No problem. The number is an estimate of how many months the product will maintain its quality after it's been opened for the first time. To find the PAO mark, look on your product's label for a small drawing of a container marked with a number and the letter M, typically on the back in the lower right-hand corner. That said, some brands opt to include a Period After Opening (PAO) mark on their packaging to indicate how long the product will remain fresh after the first use, and lots of hair-care brands have followed suit. Unfortunately, it's entirely up to each individual brand if it wants to print an expiration date on its products, so many simply don't. "But it's still not a good idea to continue use." How do you read the expiration date code on hair products? Defining BMP functions in the hair follicle by conditional ablation of BMP. "The risk is definitely lower with hair products since it isn't on your skin or around sensitive areas like the eyes and mouth," Dindio says. The effect of allomatrix injectable putty on the outcome of long bone. Luckily, using a contaminated hair product doesn't pose as great a threat as using contaminated skin care or makeup.
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