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Regarding this, is it safe to use expired hair products?
Nowthe majority of hair products will be still safe touse just after the recommended use by date but it whenit comes to beauty products, you should be moreconservative. The biggest risk for a product expiring is notnecessarily the time but how they've been stored.
Herein, how long do hair products last?
If so, how do you know when they are no longer any good? A:As a rule of thumb, unopened hair care products have a shelflife of three years. This however drops to 18 months once theproduct has been opened in the case of non-aerosol andnon-spray products.
Extremely expired bottles of shampoo andconditioner typically smell funny or even acrid and feelfunny between your fingers. If there's no label, a good rule is tokeep unopened bottles for no more than three years and an openedbottle for at most 18 months. Anything after that you may bepushing your luck!