Ohio Cosmetology License Practice Exam 2025 - Free Cosmetology License Practice Questions and Study Guide

The primary function of a conditioner in hair care is to moisturize and smooth the hair. Conditioners are formulated with ingredients that help to hydrate the hair shaft, making it more manageable and reducing frizz. They work by coating the hair cuticle, which makes the hair feel smoother and softer. This hydration not only improves the overall appearance of the hair but also helps to protect it from damage caused by styling and environmental factors.

While other options may address important aspects of hair care, they do not accurately capture the primary role of a conditioner. Protecting the hair from heat is typically the function of heat protectants rather than conditioners. The adding of color is a characteristic of hair dyes, not conditioners, and removing excess oil is associated with shampoos designed to cleanse the scalp and hair. In contrast, conditioners are specifically designed to improve hair texture and hydration, which is why moisturization and smoothing are their key functions.