Louisiana Cosmetology Board Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

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What can excessive heat exposure do to hair?

Make it stronger

Cause damage, dryness, and loss of elasticity

Excessive heat exposure to hair can lead to significant damage, resulting in dryness and a loss of elasticity. Hair is primarily made of a protein called keratin, which can be compromised by high temperatures. When hair is subjected to excessive heat from styling tools such as flat irons, curling irons, or blow dryers, the moisture content within the hair cuticle can evaporate. This leads to dryness, making the hair more brittle and prone to breakage.

Over time, the structural integrity of the hair may decrease, which diminishes its elasticity. Elasticity is crucial for hair’s ability to return to its original shape after being stretched. When this is lost due to prolonged heat exposure, the hair becomes more susceptible to damage and split ends. Therefore, it is vital to use heat protectants and limit heat styling to maintain healthy, resilient hair.

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Enhance its shine

Promote hair growth

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