What must a practitioner provide upon demand when using an electric file?

When using an electric file, a practitioner must provide documentation of proficiency upon demand. This requirement is in place to ensure that the individual is qualified and has received appropriate training in the use of electric files. Proficiency documentation demonstrates that the practitioner has the necessary skills and knowledge to operate the equipment safely and effectively, minimizing the risks of injury to clients and ensuring a high standard of service.

Providing proof of client consent, while important in many aspects of treatment, does not specifically relate to the training or competency in using an electric file. Product receipts and calculating costs are also unrelated to the practitioner's qualifications with the tool and do not serve the purpose of verifying their proficiency. Thus, the focus on documentation of proficiency highlights the importance of safety and accountability in the use of specialized equipment in the field.