Why should barbers ask about allergies before starting a haircut?

Asking about allergies before starting a haircut is crucial for preventing allergic reactions to products. Barbers often use various hair care products, including shampoos, conditioners, dyes, and styling products, which may contain ingredients that could trigger allergic responses in some clients. By inquiring about allergies, barbers can avoid using any products that might cause discomfort or harm to the client, ensuring their safety and well-being during the grooming process. This practice not only protects the clients but also fosters a more positive experience, as clients feel that their health concerns are being taken seriously and addressed appropriately.