Alabama Barber Practice Exam 2025 - Free Barber Practice Questions and Study Guide

Hair serum or leave-in conditioner is specifically formulated to provide moisture and smoothness to the hair, which is vital for controlling frizz. These products often contain silicones or natural oils that help to coat the hair strands, sealing in moisture and creating a barrier against humidity. By doing so, they help to maintain the hair's natural texture while preventing the unwanted frizz that can occur, particularly in humid conditions.

In contrast, hair gel primarily provides hold and structure to hairstyles but does not typically offer the moisturizing benefits needed to combat frizz. Hair spray is used for setting styles in place and can sometimes lead to dryness if used excessively. Mousse adds volume and body to the hair but does not directly address the moisture retention that is crucial for frizz control. Therefore, the effectiveness of hair serum or leave-in conditioner in maintaining hydration and smoothness makes it the ideal choice for controlling frizz.