One major mistake women make is using a metal round brush to dry their hair when it's wet. Think about it: you're basically heating up metal with your blow dryer and then sicking your strands on it. Can you say sizzle? Instead, use a metal round tool, like Drybar's Full Pint Medium Round Brush ($40), on your hair when it's 80 percent dry or more to create soft, supple curls. Hello, Kate Middleton!