What should be done before applying a chemical treatment to hair?

Before applying a chemical treatment to hair, conducting a patch test is essential. A patch test involves applying a small amount of the chemical product on a small section of the skin, usually behind the ear or on the inner elbow, to check for any allergic reactions or sensitivities. This step is crucial for ensuring the safety of the client, as it helps to identify potential adverse reactions that could occur if the entire head were treated without prior testing.

Chemical treatments can contain harsh ingredients that may provoke allergic responses in some individuals. By performing a patch test, you can protect the client from possible skin irritations, rashes, or other adverse effects that might occur if the product is used without first checking for sensitivity. This precaution helps maintain the client's health and trust in the services provided.

While washing the hair with shampoo, trimming the hair, or using a heat protectant may be important steps in preparing for various hair treatments, they do not address the immediate concern of ensuring the client is not allergic to the chemicals involved in the treatment. Conducting a patch test stands out as the best practice for client safety before proceeding with any chemical application.