Illinois Cosmetology Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

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What do you call the tool used to smooth and straighten hair?

Curling iron

Hair brush

Flat iron

The tool used to smooth and straighten hair is known as a flat iron. A flat iron is specifically designed with heated plates that can be adjusted to different temperatures, allowing for effective straightening of various hair textures. When the hair strands pass between the heated plates, the heat causes the hair's cuticle to relax, resulting in a sleek, smooth finish.

In contrast, a curling iron is used for creating curls or waves, which is its primary function, rather than straightening. A hair brush, while useful for detangling and styling, does not apply heat like a flat iron; thus, it is not effective for straightening. A blow dryer can help to dry and style hair and can assist in straightening when used with a brush, but it is not specifically designed for smoothing. Therefore, the flat iron stands out as the optimal tool for achieving straight hair.

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Blow dryer

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