Turn your head upside down. Loosely blow-dry using fingers until hair is 80 percent dry, then clip the top layers up and out of the way. Working in chunky 3- or 4-inch sections, hold a round brush flush to your scalp, pointing the dryer directly at your roots and sweeping it left and right for 20 seconds. "To smooth your ends, drag your brush downward for the last five seconds," says stylist Sean Gallagher of the Sally Hershberger Salon in N.Y.C. Now, knock yourself out on the top layers (see trick No. 4).
Conair Infiniti Pro hair dryer, $35; folica.com.Read MoreLess