Kentucky Cosmetology State Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The purpose of pH in hair care products primarily revolves around maintaining the hair’s integrity and structure. Hair is composed of keratin, and its health is greatly influenced by the pH level of the products used. The hair and scalp have a natural pH level of around 4.5 to 5.5, which is slightly acidic. This acidity helps to protect the hair cuticle and maintain moisture balance.

When hair care products are formulated to align with this natural pH range, they assist in keeping the hair cuticle closed and healthy, which in turn enhances shine and reduces frizz. If the pH is too high and becomes alkaline, the cuticle can become raised or damaged, leading to increased porosity and vulnerability to environmental stressors. Therefore, ensuring the proper pH balance is crucial for the overall health and appearance of the hair, thereby making the maintenance of the hair's integrity and structure essential in product formulation.