Problem: Dull hair
Blame it on: Styling and general wear and tear, which cause the hair's outer layers, the cuticles, to peel off and reflect light unevenly. "If your hair is curly, you'll never get a really high shine; it's just not physically possible," says Mario Russo, owner of the Mario Russo Salon in Boston. "Because it bends and twists, curly hair can't reflect as much light as straight hair."
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