Depending on your hair type, we recommend a general temperature range for using our products. Normal Hair: We recommend a temperature range of 360-380 degrees Fahrenheit. Coarse, Thick, Curly, or Ethnic Hair: We recommend a temperature range of 380-410 degrees Fahrenheit. Bleached, Chemically Treated, Damaged, or Fine Hair: We recommend a temperature below 360 degrees Fahrenheit. Of course, you are the best judge for your hair, and should always use your own discernment when applying heat to your hair.