Arizona Cosmetology Practice Exam

What is a key characteristic of acid balance shampoos?

1. They increase the pH of hair and scalp

2. They lower the pH to restore hair's natural acidity

3. They contain sulfates for cleaning

4. They are designed for very dry hair

The correct answer is: They lower the pH to restore hair's natural acidity

Acid balance shampoos are formulated with a lower pH that aligns with the natural acidity of the hair and scalp. This characteristic is crucial because the hair's cuticle, which is the outer protective layer, is more likely to remain closed and intact when exposed to a slightly acidic environment. By lowering the pH, acid balance shampoos help to restore and maintain the hair’s natural acid mantle, which can be disrupted by environmental factors and the use of alkaline products. This restoration of acidity can aid in improving shine, minimizing frizz, and enhancing overall hair health. This effect is particularly important for maintaining the integrity of chemically treated hair, which can be more susceptible to damage.