Be on the premises, examine, diagnose, authorize, and approve work prior to patient departure are all part of which type of supervision?

The correct answer is direct supervision because this type of supervision requires the supervising dentist to be physically present on the premises while the dental hygienist performs their duties. In direct supervision, the dentist must examine and diagnose the patient's condition, authorize specific procedures, and approve the work conducted by the dental hygienist before the patient leaves the office. This close oversight ensures that the treatment being provided aligns with the dentist's professional judgments and standards of care.

In contrast, general supervision allows dental hygienists to perform certain tasks without the dentist being on-site, provided the necessary procedures were determined in advance. Indirect supervision is similar to general supervision but usually implies a greater level of communication between the dentist and hygienist where the dentist is available by other means (such as phone). Independent practice allows dental hygienists to work without the direct supervision of a dentist, focusing on providing preventive care and education to patients directly.