"By doing light underneath you get a peekaboo effect that gives you style and individuality- like a fashion accessory on your head."

"Jennifer Aniston's hair isn't flat and it's a bit undone, which makes it modern," says New York City celeb stylist Gad Cohen.

Even celebs are flashing them. "Roots can look cool if hair's clean and not pin-straight," says start stylist Gad Cohen. All you diehards relax!

"Don't be discouraged by Cohen's almost insultingly robust head of hair or the deep fluff of Old English sheepdog, Beau. Cohen a master of fine hair, gives an intelligent sleek cut that actually seems to build volume. The trick he says, is "fake layering" : lieetle imperceptible pieces that hold the hair away from the scalp.Ok, it won't transform you into Ann- Margret, but you won't look like Pee-wee Herman either."

"Tie it on the end of a loose braid or use it in a headband," says New York City stylist Gad Cohen.

Who do celebs run to on bad hair days? Our big-name experts. What do the experts depend on? The treatments and tools they've selected here. The panel: ...NYC's Gad Cohen, whose clients include Cindy Crawford and Claudia Schiffer.