What is the first step to take before performing any chemical service on hair?

The first step to take before performing any chemical service on hair is to conduct a thorough consultation and a patch test for allergies. This step is crucial for several reasons.

A comprehensive consultation allows the cosmetologist to understand the client's hair history, preferences, and any potential risks associated with the chemical service. It’s an opportunity to assess the client's hair type, texture, and any previous treatments that may affect the outcome.

The patch test for allergies, often performed with products that contain strong chemicals, is essential for ensuring the client's safety. It helps to identify any allergic reactions that could occur from the chemicals used in the treatment. Conducting this test minimizes the risk of adverse reactions, which could lead to discomfort or more severe implications, and ensures that the client is informed and comfortable with the procedure.

In contrast, while applying a leave-in treatment, washing the hair, or styling with heat may be components of the overall hair care routine, they do not address the critical preliminary safeguarding steps necessary before proceeding with potentially harmful chemical processes.