Washington Cosmetology License Practice Exam

What is the role of pH in chemical hair treatments?

1. It determines hair color

2. It affects the hair's cuticle

3. It defines hair length

4. It is unrelated to hair treatments

The correct answer is: It affects the hair's cuticle

The role of pH in chemical hair treatments is crucial as it affects the hair's cuticle. The cuticle is the outermost layer of the hair shaft, and its condition greatly influences how hair absorbs and retains treatments, dyes, and moisture. A well-maintained cuticle lays flat and protects the inner layers of the hair, while an imbalanced pH can lead to the cuticle becoming rough or raised. This can result in poor treatment results, increased porosity, and frizz, as well as diminished shine and manageability. In many hair treatments, particularly when using products that alter the hair structure or color, maintaining the correct pH balance ensures that the cuticle remains in optimal condition for better adhesion of products and overall hair health. This understanding is vital for cosmetologists to achieve desirable outcomes in hair treatments.