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

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What is the main ingredient found in most shampoos?

Alcohol

Glycerin

Surfactants

The primary ingredient in most shampoos is surfactants. Surfactants are fundamental because they function as cleansing agents, allowing the shampoo to effectively remove dirt, oil, and product buildup from the hair and scalp. These compounds lower the surface tension between the hair and the water, enabling the shampoo to spread easily and lather well.

Surfactants also help to emulsify oils, which is crucial for ensuring a thorough cleaning process. Common surfactants used in shampoos include sodium lauryl sulfate and ammonium lauryl sulfate, which contribute significantly to the foaming and cleaning action of the product. Understanding the role of surfactants is essential for anyone in the cosmetology field, as it informs not only the choice of products but also how they affect the hair and scalp during cleansing.

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