All of the following are guidelines to be followed during the service, except:

The correct answer highlights a critical aspect of client safety during hairstyling services. Postponing the treatment of a burn until after the service poses significant risks to the client's well-being. It's essential to prioritize client care and address any injuries immediately, as failures in prompt treatment can lead to further complications, infections, or increased discomfort for the client.

The other guidelines reinforce best practices in providing a safe and professional environment. Maintaining cleanliness of the work area is vital for hygiene and helps in preventing the spread of infections. Regular communication with the client ensures they are comfortable and aware of the services being performed, which also enhances their overall experience. Performing a patch test, when necessary, is crucial for identifying any allergic reactions to products that may cause harm if used without prior testing.

In this context, addressing any burns or injuries is non-negotiable and should take precedence over the continuation of services.