Break It: Dialing down the heat on flatirons actually does more harm than good, says N.Y.C. stylist Robert Vasquez. "Dragging the flatiron on that same piece over and over again is what weakens the hair’s outer protective layer," he says. Divide hair into 2-inch sections and glide the iron slowly, gradually increasing pressure from roots to ends and making only one pass at the highest setting (typically 410 degrees).
CHI Gold-Plated Ceramic Iron, $288; farouk.com for store locations.