A hair dryer should always be used on the lowest setting that is effective for your purpose. Use the high speed and high heat setting—and keep the dryer moving—when removing excess moisture from towel-dried hair. When hair is about 75-80% dry, switch to a lower heat and speed setting to style your hair. Dial down to the dryer's cool setting to set your style when it's dry. Use a warm setting if your hair is damaged or fragile, and always use a cool to warm setting when blow drying children's hair. A child's head is very sensitive and their fine hair cannot withstand high heat temperatures.