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Myth #3: A cold-water rinse makes your hair shinier.
Hairstylists love to spread this gospel. Their rationale: The icy water will make the cuticle of your hair close so it's flat (and light-reflective), not ruffled (and dull-looking). Your hair, however, contains no living cells -- it doesn't react to cold (or hot) water, says chemist Mort Westman.
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I disagree with this one. A metal ball isn't made of living cells, either, but it certainly expands and contracts with temperature changes. The myth could still be false, depending on the contractibility of hair cells. But you can't say it's because hair cells aren't living.