Iowa Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The importance of pH levels in hair care products lies in their role in helping maintain the hair's natural acidity. Human hair typically has a pH level ranging from 4.5 to 5.5, which is slightly acidic. This acidity is crucial for the health of hair because it helps to close the cuticle (the outer layer of the hair), keeping moisture in and preventing damage from environmental factors and styling tools.

When hair care products are formulated with the right pH, they can effectively support the hair's natural state. For example, products with a lower pH can help to smooth the hair cuticle, resulting in shinier, healthier-looking hair. Conversely, products that are too alkaline can cause the cuticle to lift, potentially leading to frizz and breakage.

Understanding pH levels allows cosmetologists and professionals to choose the right products based on the client's hair type and condition, making it a vital component in effective hair care and treatment.