Utah Cosmetology and Barbering Practice Exam 2026 - Free Cosmetology and Barbering Practice Questions and Study Guide

Sodium hydroxide is commonly used in hair relaxers due to its strong alkaline properties, which allow it to effectively break down the disulfide bonds in the hair's keratin structure. This process is essential for transforming curly or wavy hair into a straighter texture. Sodium hydroxide works efficiently to soften the hair, making it malleable so that the desired sleek, straight look can be achieved.

In addition, its potency enables it to produce significant results in a relatively short period, which is often necessary in salon settings where time is a factor. The high pH level associated with sodium hydroxide also plays a crucial role in altering the hair’s structure, which is critical for successful relaxing.

Other chemicals listed might also be involved in hair treatments but are not typically employed as the primary active agent in traditional hair relaxers.