Milady Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Question: 1 / 400

What is the optimal pH range for shampoos?

3.0 to 4.0

4.5 to 5.5

The optimal pH range for shampoos is 4.5 to 5.5. This range is important because it closely matches the natural pH of the scalp and hair, which is slightly acidic. Maintaining a pH level within this range helps to preserve the hair's cuticle, resulting in smoother hair that reflects light better and has less frizz.

Formulating shampoos within this pH range also supports the natural acid mantle of the scalp, promoting healthy hair growth and scalp conditions. A shampoo formulated at this pH can effectively cleanse without stripping away essential oils or damaging the hair. Additionally, using shampoos outside this range can lead to excessive dryness or irritation, which may result in various hair and scalp issues.

This choice reflects a fundamental understanding of hair chemistry and the importance of pH balance in hair care products.

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5.5 to 6.5

6.5 to 7.5

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