Which of the following is a requirement for estheticians regarding client records?

Keeping detailed records for each treatment is essential for estheticians as it ensures accurate documentation of clients' treatments, skin conditions, and progress over time. This comprehensive approach enables estheticians to tailor subsequent treatments based on the individual needs and responses of each client, fostering a more personalized and effective service. Additionally, maintaining thorough records helps to establish a professional standard of care, allowing estheticians to track any changes or reactions, which is crucial for safety and efficacy in their practice.

While other options may include some relevant practices—such as maintaining records for a required length of time or providing copies to clients—detailed treatment records are foundational to the ongoing care and relationship between estheticians and their clients. This attention to detail supports both client safety and professional practice standards.