Colorado Barbering Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The ideal pH level range for most hair products is 4.5 to 5.5. This range is important because hair and scalps typically maintain a slightly acidic pH, which helps keep the cuticle layers of the hair closed, promoting shine and reducing frizz. Products that are within this pH range can help maintain hair's natural moisture balance and ensure that the protective cuticle stays intact, thereby preventing damage and promoting overall hair health.

Using products with a pH level significantly outside of this range can lead to adverse effects. For instance, higher pH levels (like those found in alkaline products) can lift the hair cuticle, making it more prone to breakage and dryness. Conversely, products with a very low pH can tighten the cuticle too much, potentially causing brittleness, and may make it difficult for other products to penetrate the hair shaft properly. Therefore, the pH range of 4.5 to 5.5 is optimal for maintaining the integrity and health of the hair while effectively performing desired styling or treatment functions.