Montana Cosmetology Licensure Practice Exam

Sodium hydroxide is commonly used in hair straightening treatments, specifically in the form of a relaxer. This chemical works by breaking the disulfide bonds in the hair's protein structure, allowing the hair to be reshaped and straightened. These relaxers are effective for individuals with curly or frizzy hair, providing a smoother and straighter appearance. While hydrogen peroxide is primarily used in hair bleaching and coloring, and ammonia is often found in hair color products as well, they do not play a direct role in hair straightening. Alcohol is typically used in formulations as a solvent or to help with product absorption but is not the key ingredient for hair straightening. Understanding the specific role of sodium hydroxide in hair processes is crucial for cosmetologists, as it highlights the importance of chemical knowledge in providing safe and effective hair treatments.