Rita Hazan Root Concealer, $25, has a superconcentrated nozzle so you can even target individual strands of gray hair. But if you have major roots to hide, it handles them well, too.
The only thing harder to cover than grays is superdark roots against blonde hair. Enter: Everpro Back 2 Blonde Root Touch Up, $12.99. It's like a little can of spray paint for your hair, and it covers roots flawlessly. The color is a soft pastel blonde -- not brassy -- and after it dries (which takes about two minutes), it stays put until you shampoo.
