Secrets Your Hair Is Trying to Tell You

Colorists swear that regular shampoos, which contain high percentages of parabens, sulfides and other detergents, strip color molecules from the hair cuticle. "These ingredients will affect the way your color looks and how long it lasts," says Hazan. But if your current shampoo doesn't contain ingredients like sodium or ammonium lauryl sulfate and sodium or ammonium lauryl ether sulfate, and you're also using a moisturizing conditioner, you don't need to spend money on a new product—unless you want to.