Oregon Cosmetology Certification Practice Exam – Study Guide & Prep

Healthy hair typically has a pH range of 4.5 to 5.5. This slightly acidic environment is important for maintaining the hair’s cuticle structure and overall health. When hair is in this pH range, the cuticles lie flat, which helps to lock in moisture and prevents damage and frizz.

Furthermore, this acidic pH is conducive to the optimal function of hair care products, which are designed to work effectively within this range. Using products with a similar pH can help preserve hair integrity and promote shine. If the pH of hair is outside this range, it can lead to issues such as dryness, brittleness, or hair that is more prone to breakage. For example, a higher pH often results in the cuticles lifting, which can lead to a rough texture.

Understanding this pH range is essential for cosmetologists in order to provide proper hair care and to select the appropriate products for their clients.