What limitation exists for RDAs under general supervision?

Under general supervision, Registered Dental Assistants (RDAs) are permitted to apply etchant on teeth during certain procedures, making this the correct choice. General supervision allows RDAs to perform certain duties as long as they are directed by a licensed dentist, who must remain available for consultation but does not have to be physically present in the office during the procedure.

Applying etchant is specifically allowed because it is a task that can be safely delegated under these conditions, and it plays a critical role in the preparation of the tooth for bonding in restorative procedures. This reflects the regulatory framework designed to effectively utilize the skills of dental assistants while ensuring patient safety and care quality.

Other tasks listed as options, such as performing cleanings, providing local anesthesia, or conducting exams, are not permitted under general supervision for RDAs. Each of these tasks requires a higher level of training, supervision, or licensure, reflecting their complexity and the level of patient care they involve. This structured delegation of responsibilities helps maintain professional standards in dental practice while ensuring the responsibilities given to RDAs are appropriate to their training and expertise.