For which service is a thermal straightening iron utilized?

A thermal straightening iron is specifically designed to straighten hair by using heat to reshape the hair's structure. When the iron is pressed against the hair, the heat breaks down the bonds that create curls or waves, allowing the hair to be styled straight. This process is particularly effective on curly or wavy hair types, making it smooth and sleek.

In contrast, curling irons are meant for creating curls or waves, while hair dryers are used primarily for drying hair after it has been washed. Hair perming involves a chemical process that alters the hair's structure to create curls or waves, which is different from the straightening action provided by a thermal straightening iron. Thus, the primary function of a thermal straightening iron is hair straightening.