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What does the cool shot on your hairdryer actually do, and when should you use it?
The cool shot on your hairdryer does not close any cuticles: it cools your hair down so the shape you just created sets. Read what cool air does and does...
Does cold water really close your hair cuticles? Here's what actually happens
No: hair cuticles are dead keratin cells without muscles and don't respond to cold water. Water and pH move your cuticles, a cold rinse gave no extra shine in testing,...
