Mississippi Cosmetology Board Practice Exam

What is the correct pH level for hair products used on chemically treated hair?

1. Between 3.0 and 4.0

2. Between 4.5 and 5.5

3. Between 5.5 and 6.5

4. Between 6.5 and 7.5

The correct answer is: Between 4.5 and 5.5

The pH level for hair products used on chemically treated hair is ideally between 4.5 and 5.5. This range is slightly acidic, which helps to maintain the natural balance of the hair and scalp. Products with this pH level assist in closing the cuticle layer of the hair, leading to smoother, shinier strands that are less prone to damage. Chemically treated hair, such as those that have been permed, dyed, or relaxed, can be more porous and susceptible to damage. Using products that fall within this correct pH range helps to ensure that the hair retains moisture and strength, while also preventing excessive dryness or breakage. Higher pH products, like those above 5.5, can open the hair cuticle too much, leading to frizz and leaving the hair more vulnerable to environmental factors. On the other hand, products with a pH lower than 4.5 can be too acidic, potentially causing irritation to the scalp and over-processing the hair. This is why maintaining the pH within the 4.5 to 5.5 range is vital for the health of chemically treated hair.