Wyoming State Board Cosmetology Practice Exam 2025 – All-in-One Guide to Exam Success and Mastery!

Question: 1 / 400

What ingredient is commonly found in products designed for chemically straightening hair?

Glycolic acid

Isopropyl alcohol

Ammonium thioglycolate

Sodium hydroxide

Products designed for chemically straightening hair typically use sodium hydroxide as a key ingredient because it is an effective relaxer that alters the structure of the hair. Sodium hydroxide is a strong alkaline substance that breaks the disulfide bonds in the hair’s keratin structure, allowing the hair to be reshaped and straightened. This process results in smoother, straighter hair that is often more manageable for consumers.

While ammonia can be found in some alternatives, and isopropyl alcohol is used in various formulations primarily for its solvent properties, neither of these serves the same function as sodium hydroxide in terms of chemically altering hair texture. Glycolic acid, primarily known for its exfoliating properties in skincare, does not relate to hair straightening. Hence, sodium hydroxide stands out as the primary active ingredient in relaxers specifically designed for this purpose.

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