The Myth: You can “close your hair cuticles” with a cold water rinse and make hair shinier.
Ever been to a salon where they blast you with cold water at the shampoo bowl? It may feel refreshing, but it’s not doing anything for your hair. “The degree to which cuticles are open or closed is not a function of temperature,” cosmetic chemist Randy Schueller said. Water itself can actually cause follicles to lift a bit (which leads to dull-looking hair) and things like relaxers and perms cause them to lift a lot. Physical and chemical damage can also cause follicles to lift. Conditioners can help with smoothing in this case, but cold water? Nope.
The Bottom Line: False