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

Chemically treated hair is considered the most porous type of hair due to the alterations made to the hair's structure during the chemical processes. Treatments such as coloring, perming, or relaxing involve the use of strong chemicals that open up the hair cuticle, allowing these substances to penetrate the hair shaft. This alteration increases the hair's ability to absorb and retain moisture, but it also compromises the hair's natural integrity, making it more susceptible to damage and breakage.

The porosity of hair refers to its ability to absorb moisture and products, which is significant for maintaining hair health and managing styling needs. Chemically treated hair often has high porosity, meaning it can hold moisture temporarily but may struggle to retain it long-term without proper care. As a result, individuals with chemically treated hair may need to use special products designed for high-porosity hair to help manage moisture levels and maintain the hair's health.