Nevada State Board of Cosmetology Practice Exam

High pH in hair products can lead to hair damage and cuticle lift. The pH scale ranges from 0 to 14, with lower values indicating acidity and higher values indicating alkalinity. Hair naturally has a slightly acidic pH around 4.5 to 5.5. When the pH of hair products is significantly higher, it can disrupt the natural structure of the hair.

The raised pH can open up the hair cuticle, which protects the inner layers of the hair. An open cuticle makes hair more porous and can lead to frizz, breakage, and overall weakening of the hair shaft. This cuticle lift can allow moisture to escape, making hair feel dry and brittle over time. Therefore, high pH can negatively impact hair health, leading to damage rather than nourishment.

The other options present beneficial effects, such as hair nourishment, shine, and improved curl definition, which are not associated with high pH levels, as these aspects usually thrive in more balanced pH conditions that keep the cuticle smooth and intact.