Connecticut Hairdresser Licensure Practice Exam 2025 - Free Hairdresser License Practice Questions and Study Guide

Sulfate-free shampoo is recommended for chemically treated hair because it is specifically formulated to be gentle and mild on the hair strands, which are often more fragile and susceptible to damage following chemical treatments. These shampoos do not contain harsh sulfates that can strip the hair of its natural oils and moisture, which is particularly important for preserving the integrity of treated hair.

Chemically treated hair requires additional care to maintain its health and vibrancy; therefore, using a sulfate-free option helps to support this by preventing excessive drying and brittleness. It also helps to retain color in color-treated hair, enhancing the longevity of the treatment. This gentle cleansing action allows for effective cleansing without compromising the hair's condition, which is essential after any chemical process.

The other options, while they may have their own benefits, do not specifically target the unique needs of chemically treated hair in the same manner as sulfate-free shampoos do.