You’ve probably heard both sides of this argument. A friend swears her hair has never been healthier since she started coloring it, while someone else tells you dye wrecked their hair for a year straight. Both of them might be telling the truth. Hair color can absolutely cause damage, but how much depends heavily on…

You reach into the cabinet for that half-used box of dye from last year, and before you even open it, you pause. Is it still good? Hair color absolutely does expire, and using it past its prime can mean anything from a color that barely shows up to a formula that irritates your scalp. Unlike…