When you get a few inches down the hair, start moving the comb in an "S" shape to sculpt them into that undulating shape. You want your roots to be smooth and straight and then the mid-shaft and ends to have that glamour-wave shape. Wes Sharpton, a stylist at Cutler Salon, says to use a comb and not a brush — the comb helps condense the hair and makes it more solid and compact, while a brush adds airiness and makes things fluffier.