New Mexico Cosmetology Practice Exam

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What is the pH range of healthy hair?

3.0 to 4.0
4.5 to 5.5
5.5 to 6.5
6.0 to 7.0

The correct answer is: 4.5 to 5.5

The pH range of healthy hair is 4.5 to 5.5, which is slightly acidic. This acidity is essential because it helps to maintain the integrity of the hair cuticle, keeping it closed and smooth. A balanced pH in this range also supports the health of the scalp and the overall condition of the hair. When hair is within this pH range, it is less prone to damage and breakage, as the natural oils and moisture are better retained. An overly alkaline environment can cause the cuticle to lift, leading to increased porosity, dryness, and susceptibility to damage. Therefore, understanding the pH range helps cosmetologists choose the appropriate products and treatments for maintaining healthy hair.