Illinois Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The curling iron is the tool specifically designed for curling hair, making it the most suitable choice for achieving this particular styling goal. Curling irons come in various sizes and shapes, allowing for a range of curl styles, from tight ringlets to loose waves. The device uses heat to shape the hair around a heated barrel, effectively creating curls that can last for several hours, depending on the hair type and the products used.

In contrast, while a hairbrush and a flat iron are versatile tools for hairstyling, they do not serve the purpose of curling hair. A hairbrush is primarily used for detangling and smoothing the hair, and a flat iron is designed for straightening hair. A hair dryer, on the other hand, is focused on drying hair and can assist in styling but does not provide the specific function of curling. Hence, the curling iron stands out as the most appropriate tool for curling hair among the provided options.