Missouri Board of Cosmetology Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Using heat protectants on hair is crucial when using heated tools because they serve as a barrier between the hair and the intense heat. Heat protectants contain ingredients that help to reduce moisture loss, prevent damage, and minimize the risk of burning or frying the hair strands. When heated tools like curling irons, straighteners, or blow dryers are applied directly to hair without protection, the high temperatures can lead to dryness, split ends, and breakage. Therefore, applying a heat protectant before styling is an essential step in maintaining the health and integrity of the hair.

When referring to other precautions, using heated tools only on dry hair helps prevent excessive moisture evaporation which can lead to frizz. However, it's not as comprehensive a practice as using heat protectants. Operating heated tools at maximum temperature can cause irreversible damage to hair, making it brittle and more prone to breakage. Likewise, using heated tools without any products in the hair overlooks the importance of protecting the hair from high heat, which can lead to severe damage and reduce overall hair quality.