Milady Cosmetology Practice Exam 2025 – All-in-One Guide to Master Your Cosmetology Certification!

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What is the main ingredient in a relaxer?

Sodium hydroxide or ammonium thioglycolate

The main ingredient in a relaxer is either sodium hydroxide or ammonium thioglycolate. These ingredients serve a crucial role in the hair-relaxing process by breaking down the disulfide bonds in the hair's structure, which allows the hair to be straightened. Sodium hydroxide is a strong alkaline compound commonly used in chemical hair relaxers for coarse or resistant hair types, while ammonium thioglycolate is a milder alternative that is often recommended for finer hair types. Both ingredients effectively alter the hair's natural wave pattern, making it possible to achieve a straighter, smoother look.

Other choices, such as hydrogen peroxide, glycerin, and alcohol, do not serve the same purpose in the context of hair relaxation. Hydrogen peroxide is primarily used as a bleaching agent, glycerin is a humectant that helps attract moisture, and alcohol can be a drying agent or solvent used in various cosmetic formulations, but none of these are utilized for relaxing hair.

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Hydrogen peroxide

Glycerin

Alcohol

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