Texas Cosmetology License Practice Exam

Question: 1 / 400

What is a common ingredient in hair relaxers?

Magnesium sulfate

Sodium nitrate

Sodium hydroxide or guanidine hydroxide

The correct choice highlights sodium hydroxide or guanidine hydroxide as common ingredients in hair relaxers. These compounds are classified as alkalis, which work effectively to break down the protein structure of curly or wavy hair. This is essential for achieving the intended straightening effect.

Sodium hydroxide, often referred to as lye, is one of the most widely used active ingredients in traditional chemical relaxers due to its potency and effectiveness in changing hair texture. Guanidine hydroxide is a milder alternative that is also used in relaxers, making it suitable for individuals with more delicate hair types.

Understanding the role of these ingredients can help in recognizing how relaxers function and the importance of following application guidelines to maintain the health of the hair and scalp.

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