Kentucky Cosmetology State Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The two main types of hair relaxers are sodium hydroxide and ammonium thioglycolate. Sodium hydroxide is a strong alkaline relaxer that works by breaking down the protein structure of the hair, allowing it to be reshaped into a straighter form. It is often referred to as lye relaxer and is known for its strength and effectiveness, especially on coarse or resistant hair types.

Ammonium thioglycolate, on the other hand, is a milder type of relaxer that is often used for fine to medium hair. This thio-based relaxer allows for a gentler process, as it does not rely on the same high pH level as sodium hydroxide to break down hair bonds. It also provides a softer, more manageable texture after the treatment.

Understanding these types of relaxers is crucial for cosmetologists, as they must choose the correct product based on the client's hair type and desired outcome. Both types have distinct characteristics that affect their use and results, making this knowledge fundamental in hair care practices.