Under what circumstance can a cosmetologist refuse to provide services?

A cosmetologist can refuse to provide services when health or safety concerns arise, or if the client is under the influence. This is crucial for maintaining a safe environment for both the cosmetologist and the client. If a client appears to be under the influence of drugs or alcohol, their ability to make informed decisions about services or to respond to instructions may be compromised. Additionally, any health concerns, such as visible infections or skin conditions, can pose risks not only to the affected client but also to others if services are rendered.

Refusing service in these circumstances protects the integrity of the profession and ensures that all clients receive care that adheres to health regulations. This adherence helps in preserving the safety and well-being of both the client and the practitioner, creating a professional atmosphere that prioritizes health standards.

Other options relate to scheduling, dissatisfaction with personal appearance, or payment methods, but these do not involve immediate risks to health or safety in the same manner as the correct answer does.