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

When curling hair with a curling iron, it is essential for the hair to be completely dry. This is because wet hair does not respond effectively to the heat of a curling iron. When heat is applied to wet hair, it can lead to hair damage, such as frizz or even potential breakage, as the moisture in the hair can turn to steam and affect the overall integrity of the hair strand.

Furthermore, curling with dry hair allows for better hold and definition of the curl, as the heat can fully penetrate the hair shaft, altering its structure as intended. It's important to ensure the hair is adequately prepped and dry before using heated styling tools to achieve optimal results and maintain healthy hair.