PSI Barbering Practice Exam 2025 – All-in-One Resource to Master Your Certification!

The primary role of an acid-based product in hair care is to balance the scalp's pH. Maintaining the appropriate pH level is crucial for overall scalp health and hair condition. Acidic products typically have a pH range of 4.5 to 5.5, which is slightly acidic and aligns closely with the natural pH of the scalp and hair. This helps to tighten the cuticle layer of the hair, reducing frizz and making the hair appear shinier and smoother. Moreover, acid-based products can also help to prevent damage caused by alkaline substances that may lift the cuticle, leading to increased porosity and dryness in the hair.

Other options such as providing moisture, depositing color, and reducing porosity are important features of hair care products, but they do not specifically relate to the primary function of acid-based products. While some acid-based products may also contribute to moisture retention or help with color longevity, their key contribution lies in pH balance, making the scalp healthier and more resilient.