Dry shampoo’s main function is soaking up oil and grease, making it a must when there’s no time for a proper shower. But it holds a styling secret, too. “Dry shampoo helps conceal dirty hair while giving the appearance of more volume,” says Jordan Blackmore, co-founder of S.Oil and Three Squares Studio in New York City. Dry shampoo’s plumping effect makes the stuff perfect for guys with thinning or fine hair, Blackmore says. “If you use a blow-dryer first, you can achieve the appearance of even more thickness,” Blackmore adds. Use somewhat sparingly, however; experts say you should still lather up about four times a week for hair and scalp health.