California Cosmetology Practice Exam

Salon products, particularly those used in hair care and skin treatment, should ideally have a pH level that generally falls between 4.5 to 5.5. This range is considered safe and effective for a variety of reasons.

First, the skin and hair have a natural pH level that often hovers around this range. Maintaining a pH close to that of the natural barrier helps in preserving the integrity of the hair and scalp, promoting hydration and reducing the risk of irritation or damage. Products with a pH level within this range are less likely to disrupt the acid mantle of the skin, which can lead to issues such as dryness or sensitization.

Furthermore, formulations that are too acidic or too alkaline can cause adverse reactions. For instance, overly acidic products can strip hair of its natural oils, leading to dryness and damage, while overly alkaline products can open up the hair cuticle too much, making hair more prone to frizz and breakage. Thus, the 4.5 to 5.5 range is optimal for maintaining healthy hair and scalp conditions while ensuring that salon services like coloring, perming, or straightening are safe and effective.