Which of the following is NOT a typical duty of an RDH during a prophylaxis procedure?

During a prophylaxis procedure, the primary responsibilities of a Registered Dental Hygienist (RDH) typically include removing plaque, removing stains, and administering fluoride treatments. These tasks are integral to ensuring the patient's oral health and preventing dental issues.

Performing X-rays, however, is not a standard duty associated with prophylaxis. While dental hygienists can take X-rays and may be involved in diagnostic processes, this task is generally categorized separately from the preventive and therapeutic measures involved in a prophylaxis procedure. Prophylaxis focuses on cleaning and preparing the teeth and gums to prevent disease rather than diagnosing existing conditions. Therefore, the correct answer highlights a duty that falls outside the typical scope of activities during a prophylaxis treatment.