Understanding the Role of Expanded Duties Dental Assistants (EDDA)

"Expanded duties" is one of those terms that means something slightly different depending on which state you're in. EDDA, EFDA and RDAEF all describe the same basic idea: an assistant allowed to do more than chairside support, usually hands-on procedures that can be reversed, such as placing and finishing certain fillings, applying sealants, or taking final impressions.

What changes day to day

A regular assistant sets up the room, handles sterilization, passes instruments, runs suction, takes x-rays once qualified and walks patients through their aftercare. An expanded-duties assistant does all of that, plus some of the work the dentist would otherwise do.

In a practice built around expanded duties, it often goes like this. The dentist numbs a patient and prepares the tooth, then moves to the next room while the assistant places and shapes the restoration. The dentist comes back to check the work before the patient leaves. Two or three rooms can run at once. That's more patients seen per day, which is why a good expanded-duty assistant is so valuable to a practice and usually paid better.

Exactly which procedures are allowed is up to each state. Some limit coronal polishing and sealants to assistants with a specific permit, and others don't allow certain tasks at all.

Colorado does it differently

Colorado doesn't issue permits or licenses to dental assistants of any kind, expanded or otherwise. Instead, the Dental Practice Act and the Colorado Dental Board's rules spell out which tasks a dentist may delegate, how much supervision is required and, for some tasks, what training has to come first. Radiography is the best-known example.

In practice, a Colorado assistant's "expanded" role depends on two things: what the rules allow, and what your dentist is willing to delegate after watching your work. That has an upside and a downside. You don't need to chase a state credential. But if a course advertises a "Colorado EDDA certification," be careful. Before paying for it, read the current rules on the Dental Board's site and ask the course provider exactly which rule its training satisfies.

Getting there

Nobody starts in expanded duties. Most assistants who end up there spent a year or two getting fast and dependable at the basics first. Along the way they qualified for x-rays (Colorado's routes), and many earned a DANB credential such as the CDA (how DANB works here).

After that, it's mostly continuing education in the specific skills your dentist wants to hand off, plus a paper trail. Keep certificates for every course and ask the dentist to sign off on your competency for each task. If you ever change offices, that folder does a lot of your talking for you.

Once you're taking on more of the work, it's reasonable to ask to be paid for it. The highest-paying dental assistant jobs has a sense of the range.

If you leave Colorado

Pennsylvania and Ohio have formal EFDA credentials, and California has the RDAEF. Each requires specific education and exams. Your Colorado experience will help, but it won't transfer automatically, so check the new state's dental board and DANB's state pages before you move.

For an overview of the career path, see our EDDA page.

Checked September 17, 2026. General information, not legal advice.