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Is There A Limit To How Long Hair Can Grow ... And 7 Other Hair Questions Answered

First Posted: 09/09/11 09:07 AM ET   Updated: 11/09/11 05:12 AM ET

Why does your hair stop growing? How come your hair looks different when you travel?

Your hair has its own set of rules about health, and we spoke to experts to find the answers to common hair health questions so you can keep your locks beautiful and healthy.

How Bad Is It To Use Heat On Your Hair Everyday?
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The important thing isn't necessarily how often you use heat on your hair; it's how hot that heat gets.

"If you use a hair dryer on very high heat, the temperature of the air coming out of it can cause something called 'bubble hair,' which is little bubbles on the inside of the hair shaft," explains George Cotsarelis, M.D., the director of the University of Pennsylvania Hair And Scalp Clinic. "The bubbles create a point of breakage and damage hair."

"It's better to decrease the frequency of heat styling if you can," says Meghan O'Brien, M.D., board-certified dermatologist at Sadick Dermatology and a consulting dermatologist for Physicians Formula. But she acknowledges that this sometimes isn't practical. If you're heat-styling, "always use products that offer thermal protection," says Luis Alvarez, the co-founder of Biomega and Aquage hair care products.
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