I blow dry my fringe straight every morning i apply a small amount of Loreal HotStraight as thermal protection before doing so.

To me the brand and power of the hair dryer doesn't mean much. But i guess you preserve your hair longer when you use lower heat settings.

Just make sure that at the end of the day, you always use conditioner after shampooing. I also recommend using hot oil weekly and getting proffesional hair treatments from saloons every once in a while