EFDA Scope Wars: Why Some States Let Assistants Do Fillings While Others Won't Allow Polishing

The dental assistant working in Minnesota can legally place and carve amalgam restorations. Drive three hours south to Iowa, and that same assistant can't even take final impressions. Welcome to the bizarre patchwork of expanded function dental assistant (EFDA) regulations that continues to fragment the profession in 2026.

While the American Dental Assistants Association has pushed for standardization for over a decade, state-by-state variations in dental assistant scope of practice have actually grown more pronounced. Some states have embraced EFDAs as essential team members capable of complex restorative work, while others maintain restrictive models that barely evolved since the 1970s.

The Wild West of Restorative Functions

At the progressive end of the spectrum, states like Minnesota, New Mexico, and Alaska allow certified EFDAs to perform functions that would make traditional dentists uncomfortable. Minnesota's expanded practice dental hygienists can place direct restorations, while New Mexico permits EFDAs to take final impressions for crowns and place temporary restorations.

"I've been practicing in Minnesota for 15 years, and our EFDAs essentially function as junior dentists for routine procedures," says Dr. Michael Thompson, who operates three practices in the Twin Cities. "When I moved here from Texas, I couldn't believe what my assistants could legally do. It's transformed how we deliver care."

But cross into neighboring Wisconsin, and the landscape shifts dramatically. Wisconsin EFDAs can't place restorative materials or take final impressions—functions considered routine in states with more liberal scopes.

The contrast becomes even starker when examining specific procedures. Colorado allows EFDAs to place periodontal dressings and remove sutures, while neighboring Kansas restricts these same professionals to basic chairside assistance and radiographs.

The Conservative Holdouts

Several states maintain surprisingly restrictive approaches to dental assistant scope of practice. Delaware, for instance, doesn't recognize expanded function designations at all, limiting all dental assistants to traditional supportive roles regardless of additional training.

South Carolina represents another conservative approach, allowing dental assistants to perform only the most basic functions: sterilization, chairside assistance, and taking radiographs under direct supervision. Even coronal polishing requires additional certification that many practices find too burdensome to pursue.

"The regulatory environment here makes it incredibly difficult to maximize our team's potential," explains Dr. Patricia Williamson, who practices in Charleston. "I have assistants with excellent skills who could easily handle more advanced procedures, but state law keeps them operating at maybe 40% capacity."

These restrictions create real staffing challenges. Practices in conservative states often struggle with productivity bottlenecks when dentists must personally perform procedures that EFDAs handle elsewhere.

The Middle Ground States

Most states occupy a middle position, allowing EFDAs to perform certain expanded functions while maintaining restrictions on others. Texas exemplifies this approach, permitting EFDAs to place and carve amalgam restorations but prohibiting composite placement—a distinction that makes little clinical sense.

Florida allows EFDAs to take impressions and place temporary restorations but draws the line at any permanent restorative work. These partial expansions often create more confusion than clarity, with practice owners uncertain about what their team members can legally accomplish.

The supervision requirements also vary significantly. Some states require direct supervision (dentist physically present), while others allow general supervision for certain procedures. Arizona permits EFDAs to work under indirect supervision for most functions, while neighboring Utah mandates direct supervision for identical procedures.

Economic Realities Drive Change

The economics of dental assistant scope expansion are compelling. According to recent data from the Dental Economics Research Institute, practices in liberal-scope states average 23% higher production per chair compared to restrictive states, primarily due to improved delegation efficiency.

But the financial benefits extend beyond productivity. EFDAs in expanded-scope states command salaries averaging $4,200 higher annually than their counterparts in restrictive jurisdictions. This creates geographic wage pressures and can influence recruitment and retention.

"States that don't modernize their scope laws are essentially handicapping their dental practices in an increasingly competitive marketplace."

The staffing implications become particularly acute in rural areas. Practices in underserved regions of liberal-scope states can maintain productivity levels that would be impossible under restrictive regulations. A single dentist working with skilled EFDAs can effectively serve patient populations that might otherwise lack adequate access.

The Standardization Challenge

Despite calls for interstate uniformity, political realities make standardization unlikely. State dental boards, influenced by varying professional constituencies, maintain different philosophies about appropriate delegation levels.

Some boards prioritize patient safety through restrictive oversight, while others emphasize access and efficiency. These fundamental philosophical differences, combined with established regulatory frameworks, create significant barriers to harmonization.

The situation is further complicated by interstate mobility issues. EFDAs moving between states often discover that their training and certifications don't transfer, requiring additional education or certification processes.

Looking Forward: Strategic Implications

For practice owners, understanding these variations becomes crucial for strategic planning. Practices considering expansion across state lines must factor scope-of-practice limitations into their operational models.

The trend toward consolidation in dentistry may actually accelerate scope expansion efforts. Large dental service organizations operating across multiple states have strong incentives to advocate for uniform, liberal scope laws that maximize operational efficiency.

Meanwhile, states with restrictive scopes may find themselves at competitive disadvantages as the dental workforce becomes increasingly mobile and practices seek jurisdictions that support team-based care models.

The EFDA scope wars aren't likely to end soon, but they're reshaping how dental practices operate and where they choose to establish themselves. In 2026, your zip code still determines what your dental assistant can legally do—and that reality increasingly influences where both practices and professionals decide to call home.