Arizona Cosmetology Practice Exam

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What is the ideal pH range for hair products to maintain healthy hair?

8.0-9.0
4.5-5.5
6.0-7.0
5.5-6.5

The correct answer is: 4.5-5.5

The ideal pH range for hair products is between 4.5 and 5.5. This slightly acidic pH is close to the natural pH of healthy hair and skin. Maintaining hair products within this range helps to preserve the hair's cuticle integrity, preventing excessive dryness, brittleness, and potential damage. When hair products are too alkaline (like those in the 8.0-9.0 range), they can open up the hair cuticle, making it more susceptible to damage and frizz. Additionally, products with a pH level above 6.0 can disrupt the natural balance of oils and moisture within the hair. Staying within the 4.5 to 5.5 range ensures that the hair remains smooth, shiny, and healthy while also preventing color fading in color-treated hair. This is essential for hairstylists and cosmetologists to keep in mind when formulating or selecting products for various hair types.