Putting 365 degrees of heat directly on your hair can cause dryness, breakage, and overall fried hair. Spritz on a heat protectant spray while your hair is damp to put a barrier between the flat iron and your hair.
Hair burns at the same temperature as paper: 451°F. The highest temperature that you should use your flat iron on is 365°F. For those with fine hair, the temperature should be between 300 and 325 degrees.