Which task is NOT considered a common duty of a dental assistant?

Performing dental cleanings is primarily the responsibility of a dental hygienist, not a dental assistant. Dental hygienists are specifically trained and licensed to carry out comprehensive prophylactic services, which include scaling and polishing of teeth, assessing periodontal status, and providing patient education on oral health. While dental assistants play an essential role in supporting clinical procedures and helping maintain the efficiency of the dental office, they do not typically perform tasks that require clinical licensure, such as dental cleanings.

In contrast, the other tasks listed, such as oral health instruction (OHI) and topical fluoride application, inserting matrix bands and wedges, and placing or removing rubber dams, fall well within the scope of practice for dental assistants. These duties support the clinical workflow and enhance patient care, making them common responsibilities of dental assistants in many practices.