What does direct supervision require of the dentist during a treatment procedure?

Direct supervision requires the dentist to remain in the room while a treatment procedure is being performed by an expanded function dental assistant (EFDA). This level of supervision ensures that the dentist is present to provide immediate oversight and to intervene if necessary during the procedure. The presence of the dentist allows for any direct evaluation of the patient's condition as well as the treatment being provided, ensuring patient safety and quality of care.

The other options suggest situations where the dentist is not physically present in the treatment room, which does not align with the definition of direct supervision. The dentist being outside the facility does not allow for immediate intervention or oversight. Being available via phone lacks the immediacy that may be crucial during a procedure. Additionally, simply reviewing patient records does not fulfill the requirement for direct supervision, as it does not involve real-time oversight of the treatment being rendered.