National Occupational Competency Testing Institute (NOCTI) Cosmetology Practice Exam

Which type of shampoo is best to use after a chemical relaxer?

1. Neutral pH

2. Acid pH

3. Alkaline pH

4. Balanced pH

The correct answer is: Acid pH

Using an acid pH shampoo after a chemical relaxer is beneficial because it helps to close the hair cuticle, which may have been raised during the relaxing process. Chemical relaxers typically have an alkaline pH, which works to break down the hair's natural bonds to achieve straightness. After such a treatment, it is crucial to restore the hair's normal pH balance. By opting for an acid pH shampoo, you ensure that the hair cuticle is sealed, promoting shine, and reducing frizz. Additionally, this type of shampoo can help prevent any potential damage caused by the relaxer and maintain the hair's overall health. Acidic shampoos can also enhance color retention if the hair has been dyed, as they help to lock in color molecules more effectively. The other options either do not provide the necessary benefits for hair post-relaxer or could worsen the hair's condition. For instance, neutral pH shampoos do not create the optimal environment for cuticle closure after an alkaline treatment, while alkaline pH shampoos can further raise the cuticle, leading to increased damage and dryness. Balanced pH shampoos may be suitable for general use but lack the specific corrective action needed after chemical processing.