What is the primary purpose of using a neutralizing shampoo after a relaxer service?

Using a neutralizing shampoo after a relaxer service is critical for restoring the pH balance of the hair. During the relaxing process, the natural pH of the hair is altered due to the chemicals used, which can make the hair more alkaline. Neutralizing shampoos are formulated specifically to re-acidify the hair and bring it back to its normal, healthy pH level, typically around 4.5 to 5.5. This step is essential because it helps to close the cuticle layer of the hair, thus preventing damage and ensuring the hair's strength and integrity after the chemical service. Restoring the pH balance not only promotes healthier hair but also helps the relaxer to maintain its effectiveness and longevity.