PSI Cosmetology Practice Exam

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What happens during the application of a chemical relaxer?

It moisturizes the hair
It breaks down protein structures
It enhances curl definition
It neutralizes pH levels

The correct answer is: It breaks down protein structures

During the application of a chemical relaxer, the primary action is the breaking down of protein structures within the hair. Relaxers work by altering the hair's internal structure, specifically targeting the disulfide bonds that give curly hair its shape. By breaking these bonds, the relaxer allows the hair to become straighter and more manageable. This process is crucial for transforming tightly curled or wavy hair into a smoother, straighter look. While moisturizing the hair or enhancing curl definition are desirable effects in various hair treatments, they do not occur with the application of a chemical relaxer. In fact, relaxers can often dry the hair out because of the strong chemicals used. Additionally, neutralizing pH levels is a process that occurs after the relaxer application to restore the hair's natural pH balance, but it is not the primary function of a relaxer itself. Understanding this core function of breaking down protein structures is essential for anyone working with chemical relaxers in a professional setting.