What factor determines the temperature setting of a curling iron?

The temperature setting of a curling iron is primarily determined by hair texture. Different hair textures require varying amounts of heat to effectively style without causing damage. For instance, fine or thin hair is more susceptible to heat damage and typically requires a lower temperature to achieve curls. In contrast, thick or coarse hair often needs a higher temperature to hold the style properly because it can withstand more heat. Understanding this principle allows hairstylists and individuals to choose the right temperature setting to achieve the desired hairstyle while minimizing the risk of damage to the hair.