Red Seal Cosmetology Practice Exam

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What must chemical hair relaxers have to penetrate the cuticle layer?

  1. Moisture

  2. Protein

  3. Vitamins

  4. An alkaline pH

The correct answer is: An alkaline pH

Chemical hair relaxers use an alkaline pH to break down the disulfide bonds in the hair's protein structure, allowing it to straighten. While moisture and protein are important for maintaining the hair's health, they are not necessary for the relaxer to penetrate the cuticle layer. Similarly, vitamins play a role in hair health, but do not specifically aid in the penetration process. Therefore, the only essential factor for the relaxer to properly work is an alkaline pH.

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