Final answer:
A registered hygienist (RDH) can perform oral exfoliative cytology under direct supervision. This diagnostic technique helps detect abnormal changes in the mouth.
Step-by-step explanation:
A registered hygienist (RDH) can perform oral exfoliative cytology under direct supervision. This means that a qualified professional, such as a dentist or oral pathologist, must be physically present and actively involved in overseeing the procedure. Oral exfoliative cytology is a diagnostic technique used to collect cells from the oral cavity for analysis. By examining these cells, healthcare professionals can detect abnormal changes in the mouth, which may indicate the presence of precancerous or cancerous lesions. The direct supervision ensures that the procedure is carried out accurately and safely, enhancing the reliability of the results obtained.