What is the primary concern when using hair products on clients?

The primary concern when using hair products on clients revolves around potential allergic reactions to the products. This is crucial because people's skin and hair can respond differently to various ingredients in hair products. Allergic reactions can result in adverse effects such as itching, redness, swelling, or even more severe reactions that could lead to hospitalization. Safety is a top priority in any beauty practice, and ensuring that products are safe for each individual client is essential for maintaining their health and well-being.

Factors like the cost of products, their scent, and their effectiveness in styling are important considerations, but they do not outweigh the immediate health risks associated with allergic reactions. Prioritizing the client's safety helps build trust and a positive reputation for the stylist or salon. Therefore, being knowledgeable about the ingredients in hair products and conducting patch tests when necessary is a best practice in the industry to avoid any negative outcomes for clients.