Massachusetts Board of Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

pH balance plays a critical role in the efficacy of hair care products because it affects how well these products can clean or condition hair. Hair and scalp have a natural pH level, typically ranging from 4.5 to 5.5, which is slightly acidic. This acidity helps to maintain the hair's outer layer, known as the cuticle, in a smooth and closed position. When the pH of hair care products is in alignment with this natural pH, the products are more effective in cleaning, conditioning, and treating the hair.

Products with a proper pH can help to maintain moisture levels in the hair, prevent dryness, and avoid damage to the hair structure. Conversely, products that are either too alkaline or too acidic can disrupt the balance, leading to issues like hair cuticle lifting, which can result in frizz, tangling, and a lack of shine. Therefore, consumers and professionals typically seek products that are specifically formulated to be pH-balanced for optimal performance in cleaning and conditioning hair.