8 of the Worst Things You Can Do to Your Hair

There is an ideal temperature that hair can be heated to before it literally burns. "It's a myth that the higher the temperature, the better when heat styling your hair," says Marjan. She recommends GHD hot tools, which are automatically programmed to the ideal heat styling temperature of 365 degrees and won't cause damage. The same goes for your blow dryer. "Unless your hair is thick and coarse, you can get away with using your dryer on the lowest heat setting that's not cold blast," says Holly Mills, hairstylist for Streeters. And while it may sound silly to say, never, ever use a hot tool on damp hair — because yes, people do this.