Illinois Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The primary purpose of a neutralizer in hair treatments is to stabilize the hair structure after curl formation. Neutralizers are used in the perming process to halt the action of the waving solution and reform the hair’s bonds into their new shape, which helps to lock in curls or waves. This step is crucial because it ensures that the newly formed structure of the hair is properly set, preventing it from reverting back to its original state.

By stabilizing the hair structure, neutralizers help maintain the integrity and longevity of the curls or waves created during the perming process. The effectiveness of a neutralizer in this context is essential to achieving desired styles that are resilient to the effects of moisture and manipulation.

The other options, while relevant to hair care, do not specifically pertain to the role of a neutralizer. Adding moisture is typically associated with conditioners, removing buildup is accomplished through clarifying shampoos, and enhancing hair color relates to dyeing processes rather than the stabilization function of a neutralizer.