Nevada State Board of Cosmetology Practice Exam

What is the effect of using a sodium hydroxide relaxer?

1. It enhances natural curls

2. It straightens curly or wavy hair

3. It adds moisture to the hair

4. It increases hair volume

The correct answer is: It straightens curly or wavy hair

Using a sodium hydroxide relaxer primarily straightens curly or wavy hair. Sodium hydroxide is a powerful chemical that penetrates the hair shaft and breaks down the protein bonds that give hair its natural curl or wave. This process alters the hair’s structure, effectively relaxing the curls and making the hair more manageable and straight. The application of a sodium hydroxide relaxer is often sought after by individuals looking to achieve a sleek, straight hairstyle from naturally curly or wavy hair. It is important to note that while sodium hydroxide can effectively straighten hair, it can also lead to damage if not applied properly or if left on for too long, which is why proper training and caution are crucial when using this type of relaxer.