New York State Cosmetology Practice Exam

What is the pH range of human hair?

3.0 to 4.0 4.5 to 5.5 5.0 to 6.0 6.0 to 7.0

Correct Answer:

4.5 to 5.5

Explanation:

The pH range of human hair is typically between 4.5 and 5.5. This slightly acidic range is important for the health of the hair and scalp. When the hair's pH is within this range, it helps to maintain the hair's natural protective layer, known as the cuticle. This protection is essential for minimizing damage from environmental factors and styling processes. Keeping hair within this pH range also plays a significant role in optimal condition and prevents issues such as frizz and breakage. Products formulated for use on hair generally aim to align with this pH to ensure compatibility and effectiveness, promoting overall hair health and stability.

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