What is the first step that should occur during a retouch sodium hydroxide relaxer service?

During a retouch sodium hydroxide relaxer service, performing a scalp analysis is the crucial first step. This analysis involves examining the scalp for any signs of irritation, abrasions, or inflammation. It is essential to ensure that the scalp is healthy and that there are no conditions that could be exacerbated by the application of a relaxer, which is a chemical treatment.

Conducting a scalp analysis helps to identify any potential risks for the client and ensures that the treatment is appropriate for their specific hair and scalp condition. If the scalp shows any issues, it may be necessary to adjust the service or postpone it to prevent further irritation or damage. This care is critical in professional cosmetology practice, demonstrating the importance of client safety and health as foundational principles before any chemical application is performed.

The other options, while related to the process, come after confirming the scalp's health. Sectioning the hair and applying the relaxer should only proceed once the scalp has been deemed suitable for the treatment. Rinsing the hair is also an action that occurs later in the service, following the application of the relaxer.