Kansas Cosmetology Practice Exam

The pH range of hair is typically between 4.5 and 5.5. This slightly acidic range is important for maintaining the health of both the hair and the scalp. At this pH, the cuticle, which is the outer layer of the hair, lies flat, allowing for better light reflection and reducing the risk of frizz and damage. An acidic pH also helps keep hair fibers strong and less prone to breakage, as it maintains an optimal balance that promotes hair moisture retention.

In contrast, a pH that is too high can cause the cuticles to lift, leading to increased porosity and potential damage. Products formulated within this pH range help to support the natural characteristics of hair and enhance its overall appearance and manageability. Understanding this pH range is crucial for cosmetologists when selecting and recommending products for hair care and treatment.