First off, hair is dead. You cannot repair something that isn’t living. Hair is made up of the same protein as our fingernails — keratin. Just as a fingernail can chip and crack, hair can easily be damaged. Heat damage to hair is typically caused by blow dryers, curling and flat irons, UV rays from the sun and chemicals in relaxers and perms.
Heat damages the hair by removing water and moisture from the hair shaft. Especially destructive, says a study published in the “Journal of Cosmetic Science,” is applying extreme heat, like a curling or flat iron, to damp, wet hair. The iron literally boils the moisture in the hair, causing the cuticle to bubble and buckle. Dry hair also sustains damage from heat sources, but to a lesser degree. The hair weakens and can break and become brittle. Thermal protector products coat the hair follicle with polymers that shield hair from heat damage.
If your hair has a straw-like texture with split ends, the first thing way to restore its health is to get a trim. Cutting your hair will immediately make it look fresher and restore its body.
Use conditioners, which penetrate into the hair. This means when you use a conditioner prior to heat exposure, you’re actually increasing the strength of the hair. The Beauty Brains scientists recommend a leave-in conditioner.
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