Rock the Connecticut Hairdresser Exam 2025 – Snip, Style, and Shine Your Way to Success!

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What is the standard pH range for hair?

3.0 to 4.0

4.5 to 5.5

The standard pH range for hair is between 4.5 and 5.5. This slightly acidic range is important because it helps maintain the hair's natural structure and prevents damage. Hair's cuticle, the outer protective layer, is composed of overlapping scales that lay flat in a slightly acidic environment. This pH range promotes healthy hair by aiding moisture retention and preventing the hair from becoming too dry or brittle.

Maintaining the hair within this pH range also minimizes the risk of chemical damage, especially when using coloring or perming products, which can be harmful if they alter the hair's natural pH balance. Products formulated for hair care typically strive to be within this range to ensure they are gentle and effective, promoting overall hair health.

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5.0 to 6.0

6.5 to 7.5

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