Dry shampoos absorb excess oil from the scalp and roots. As a result, they give hair a clean, fresh, and matte look. Plus, they can extend the staying power of your hairstyles and allow you to go longer between hair washes, which can help to prevent color fade. But while dry shampoo gives hair a cleaner look, they do not replace regular shampoo. Thus, purifying hair with shampoo two or three times a week is essential.