Maine Cosmetologist Practice Exam – Practice Test & Study Guide

The process to create curls using a curling iron is known as thermal curling. This technique involves the application of heat to the hair through the curling iron, which alters the hair's structure temporarily, allowing it to take on a curled shape. The heat emitted from the curling iron breaks the hydrogen bonds in the hair, and when the hair cools, the bonds reform in their new, curved position.

Thermal curling is a quick and effective way to add curls and volume to styles, making it a preferred method among stylists for special occasions or everyday looks. It also allows for versatility, as the size and tightness of the curls can be adjusted depending on the size of the curling iron used and the technique employed.

Other processes mentioned in the choices serve different purposes. Perming involves a chemical process that changes the hair's texture permanently, setting typically refers to a method of styling hair using rollers or setting lotion to hold curls without heat, and waving can refer to adding waves in a different technique, often associated with softer, looser curls rather than the defined curls created through thermal curling.