Why Heat is Bad for Hair

Everyone knows that heat is bad for hair. Blow drying causes "flash drying" which removes moisture from the cuticle of the hair causing drying and brittleness. Other heat appliances like hot rollers, curling irons, and straighteners crack the edges of the hair cuticle leading to hair breakage, frizz, and some seriously split ends. So how do we protect our hair from the heat?


Of course the best policy is keep your hair away from heat producing appliances, but for many, this is simply not possible.  For those who must blow dry, try choosing products that contain glycerin and/or hydrolyzed wheat protein.  These two ingredients have been shown in studies to help reduce cuticle cracking.

Another ingredient that may reduce heat damage is cetrimonium chloride. Usually contained in conditioners, cetrimonium chloride can actually increase the strength of individual hairs when used in conjunction with heat by cross-linking protein chains inside the hair. Still, the best practice for optimum hair health is to avoid heat altogether. Try natural-looking styles like a classic bun, the endless varieties of ponytails, the messy updo, or the scrunched look.

References:

Ruetsch, S.B, et al, “Effects of Thermal Treatments with a Curling Iron on Hair Fiber,” J. Cosmetic Science, 55, 13-27 Jan/Feb 2004.