Before applying a chemical treatment, what is critical to know about a client?

Understanding a client's health conditions or allergies is crucial before applying a chemical treatment because these factors can significantly impact the safety and effectiveness of the treatment. Chemical treatments often contain strong substances that could provoke allergic reactions or cause adverse effects if the client has certain health conditions.

For example, someone with sensitivities may react poorly to chemicals such as ammonia or peroxide, which are commonly found in hair dyes and relaxers. Knowing about any allergies ensures that the stylist can select appropriate products and avoid those that could cause harm. Additionally, being informed about health issues allows the stylist to consult any necessary medical advice before proceeding with services.

While knowing a client's hair color preference, previous hairstyles, and favorite products are important for personalizing the treatment and ensuring client satisfaction, those factors are secondary to health considerations. The primary responsibility of any hair service professional is to ensure the client’s safety during the service.