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

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What is the pH range for healthy hair?

3.0 to 4.0

4.5 to 5.5

The pH range for healthy hair is typically between 4.5 to 5.5. This slightly acidic range is ideal because it helps to keep the hair cuticle smooth and closed, which in turn promotes shine and reduces frizz. Hair with a pH within this range is less prone to damage and is more resilient against external factors, such as environmental stressors and chemical treatments.

Maintaining the appropriate pH balance is crucial for overall hair health because products that are too alkaline can raise the hair cuticle, leading to dryness and breakage. Conversely, formulations that are too acidic could potentially lead to irritation of the scalp or a buildup of product. Thus, a pH of 4.5 to 5.5 strikes a healthy balance that supports the integrity of the hair while ensuring the scalp remains comfortable.

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5.5 to 6.5

6.5 to 7.5

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