New Jersey Cosmetology and Hairstyling Practice Exam

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What is the standard pH range for hair products?

3.5 to 4.5

4.5 to 5.5

The standard pH range for hair products is between 4.5 to 5.5, as this range closely aligns with the natural pH of healthy, unprocessed hair and scalp. Maintaining a pH within this range is crucial because it helps to ensure that the hair cuticle lies flat, which promotes shine and minimizes frizz. Products formulated with this pH level can effectively cleanse and condition hair without causing damage or stripping away natural oils.

Using products with a higher pH can open the hair cuticle excessively, leading to dryness and potential damage over time. Conversely, very low pH products can lead to tangling and make hair feel rough. Therefore, the pH range of 4.5 to 5.5 is optimal for both maintaining the hair's health and providing effective styling and treatment benefits. This balance is particularly important in professional settings, such as salons, where the integrity and appearance of hair are prioritized.

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5.5 to 6.5

6.5 to 7.5

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