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Ever notice how straight hair looks almost incandescent when it catches the light? That extra-glossy effect isn't an illusion, says dermatologist Jeannette Graf. "Flat-ironing helps ruffled hair cuticles lie flat, which creates more surface area to reflect light," she explains. Just be sure not to...

Not all hair colors are created equal, which means you should wash, rinse, and repeat accordingly. Lighter hair is porous and more susceptible to buildup, so it's shiniest when it's cleanest, says Clairol Global Creative Director Marcy Cona. Those with brunette or deep auburn strands...