The heat from ironing severs any bonds remaining between the proteins that were not cut by the straightener. The ironing process restructures the hair into a straight form and smoothes the cuticle layers on the surface of the hair. Your stylist will adjust the temperature, moisture level inside the hair, and heat application time based on the condition of your hair. Different ironing techniques yield different finishes. Your stylist may choose to blow dry your hair instead of ironing for a more natural finish.