L’Oréal Paris Couleur Experte

No rookie mistakes with this all-in-one box, which includes a base color, a highlighting cream, and a brush you can attach to your index finger for foolproof placement. “Applying high lights is the hardest thing to do at home, and this makes it easier,” says L.A. hairstylist Charles Dujic, who uses it for “fantastic results” when he does quick fixes outside the salon.