Which type of alteration in oral anatomy is forbidden for dental assistants to engage in?

Irreversible alterations in oral anatomy are forbidden for dental assistants because such procedures can significantly change the structure of the teeth and surrounding tissues, often requiring advanced knowledge and skills that fall under the scope of practice for licensed dental professionals, such as dentists and dental hygienists. These alterations can impact a patient's oral health, function, and aesthetics permanently.

In contrast, reversible changes, whether temporary or minor, do not result in lasting modifications to the oral anatomy and typically fall within the duties that dental assistants can safely perform under proper supervision. This restriction is in place to ensure patient safety and maintain the integrity of dental care, as irreversible procedures can entail significant risks and potential complications if not performed by a qualified professional.