In cosmetology, what is the role of pH in hair products?

The role of pH in hair products is critically important because it affects the hair's cuticle opening and closing. The hair cuticle is the protective outer layer of the hair shaft, and its condition can significantly impact the overall health and appearance of the hair.

When the pH of a product is low (acidic), it encourages the cuticle to lay flat, which helps to retain moisture, adds shine, and makes the hair more manageable. In contrast, when the pH is high (alkaline), it raises the cuticle, making it more porous and prone to damage and frizz. By understanding and utilizing appropriate pH levels in hair products, cosmetologists can achieve desired results, such as improved conditioning, better color retention, and overall hair health.

While pH does have an influence on other aspects of a product, such as stability and compatibility, its most significant impact lies in its direct effect on the hair cuticle, which is critical for maintaining the integrity and appearance of the hair.