Allied dental professional scope of practice

Evidence Rating  
Evidence rating: Some Evidence

Strategies with this rating are likely to work, but further research is needed to confirm effects. These strategies have been tested more than once and results trend positive overall.

Health Factors  
Decision Makers
Date last updated

The roles of allied dental professionals can be expanded by increasing the scope of duties they are statutorily allowed to perform, decreasing dentist supervision requirements, or developing opportunities for mid-level professionals. Allied dental professionals include dental assistants, community dental health coordinators, dental hygienists, and dental therapists1. Allied dental professionals are often called dental auxiliaries2. In partnership with dentists, dental auxiliaries increasingly provide care in community settings such as schools, nursing homes, community health centers, and Indian health centers3. Dental therapists perform examinations, preventive services, local anesthesia, restorations, and extractions under the indirect supervision of dentists4. Domestically, dental therapists currently practice only in Minnesota, Maine, and tribal areas of Alaska5.

What could this strategy improve?

Expected Benefits

Our evidence rating is based on the likelihood of achieving these outcomes:

  • Increased access to oral health care

Potential Benefits

Our evidence rating is not based on these outcomes, but these benefits may also be possible:

  • Increased availability of health professionals in underserved areas

  • Reduced cavities

What does the research say about effectiveness?

There is some evidence that expanding the roles of allied dental professionals increases access to oral health care6, 7, 8. A number of studies indicate that allied dental professionals who have been trained to perform restorations and other treatments can perform these treatments as well as dentists1, 2, 3, 7, 8, 9. Additional evidence is needed to confirm effects and determine which role expansions best increase access to care2, 3.

Dental therapists provide care with indirect dentist supervision and have been shown to increase access to dental care and reduce cavities, especially via programs for low income school children6, 7. In Minnesota, dental therapists are required to serve underserved populations; early evidence suggests greater access to oral health care in rural and metropolitan areas10. Dental hygienists who serve in community settings under policies that support a similarly broad scope of practice (i.e., direct access policies) also appear to increase access to care for elderly individuals, those with special needs, children, minorities, and rural populations3. Patients report satisfaction with care provided by dental auxiliaries2.

Evidence regarding the effect of expanded function allied dental professionals on private practice income is mixed7, 8, 11, 12; financial effect appears to depend on the functions performed, office composition, and caseload1, 12. Studies in New Zealand, Australia, and Canada suggest that dental therapists can be cost effective, particularly when treating children4; additional evidence is need to determine economic viability in the U.S.9.

Insurance reimbursement policies may not support expansion of auxiliary roles; for example, as of 2014, dental hygienists may be directly reimbursed as Medicaid providers in only 16 states3.

How could this strategy impact health disparities? This strategy is rated likely to decrease disparities.
Implementation Examples

Many states have revised or considered revising their dental scope of practice laws in the last decade13. As of 2016, 39 states allow dental hygienists to initiate patient care outside of traditional dental offices, without the presence of a dentist5 and as of 2014, 16 states allow dental hygienists to receive direct reimbursement for care provided to Medicaid eligible patients3. As of 2014, only 15 states explicitly bar independent practice14

Dental therapists practice in more than 54 countries including Canada, Australia, and Great Britain10, 15, and domestically in Minnesota, Maine, and Alaska Native villages4, 5.

Implementation Resources

DANB - Dental Assisting National Board Inc. (DANB). Meet state requirements.

LawAtlas-Dental hygienist - LawAtlas. Dental Hygienist Scope of Practice Laws Map.

Pew-Expand dental - The Pew Charitable Trusts (Pew). Expanding the dental workforce.

ME-Ch 575 2014 - Eves M. Chapter 575: An act to improve access to oral health care H.P. 870 - L.D. 1230. Augusta: State of Maine Legislature; 2014.

MDA-Dental therapist - Minnesota Dental Association (MDA). Career Center: Dental Therapist.

ADHA-Dental hygiene programs - American Dental Hygienists’ Association (ADHA). Education & careers: Dental hygiene programs.


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1 Rodriguez 2013b - Rodriguez TE, Galka AL, Lacy ES, et al. Can midlevel dental providers be a benefit to the American public? Journal of Health Care for the Poor and Underserved. 2013;24(2):892–906.

2 Dyer 2016 - Dyer TA, Robinson PG. The acceptability of care provided by dental auxiliaries: A systematic review. Journal of the American Dental Association. 2016;147(4):244–254.

3 Naughton 2014 - Naughton DK. Expanding oral care opportunities: Direct access care provided by dental hygienists in the United States. Journal of Evidence Based Dental Practice. 2014;14(Suppl 1):171–182.e1.

4 Friedman 2014 - Friedman JW, Mathu-Muju KR. Dental therapists: Improving access to oral health care for underserved children. American Journal of Public Health. 2014;104(6):1005–1009.

5 ADHA-Provider models - American Dental Hygienists’ Association (ADHA). The benefits of dental hygiene-based oral health provider models.

6 Simmer-Beck 2015 - Simmer-Beck M, Walker M, Gadbury-Amyot C, et al. Effectiveness of an alternative dental workforce model on the oral health of low-income children in a school-based setting. American Journal of Public Health. 2015;105(9):1763–1769.

7 Bailit 2012 - Bailit HL, Beazoglou TJ, DeVitto J, McGowan T, Myne-Joslin V. Impact of dental therapists on productivity and finances: I. Literature review. Journal of Dental Education. 2012;76(8):1061-7.

8 Galloway 2002 - Galloway J, Gorham J, Lambert M, et al. The professionals complementary to dentistry: Systematic review and synthesis. London: University College London, Eastman Dental Hospital, Dental Team Studies Unit; 2002.

9 Phillips 2013 - Phillips E, Shaefer HL. Dental therapists: Evidence of technical competence. Journal of Dental Research. 2013;92(7 Suppl 1):11S–15S.

10 Blue 2016 - Blue CM, Kaylor MB. Dental therapy practice patterns in Minnesota: A baseline study. Community Dentistry and Oral Epidemiology. 2016;1–9.

11 Beazoglou 2012a - Beazoglou TJ, Chen L, Lazar VF, et al. Expanded function allied dental personnel and dental practice productivity and efficiency. Journal of Dental Education. 2012;76(8):1054–60.

12 Beazoglou 2012b - Beazoglou TJ, Lazar VF, Guay AH, Heffley DR, Bailit HL. Dental therapists in general dental practices: An economic evaluation. Journal of Dental Education. 2012;76(8):1082-91.

13 Elwood 2013 - Elwood TW. Patchwork of scope-of-practice regulations prevent allied health professionals from fully participating in patient care. Health Affairs. 2013;32(11):1985–1989.

14 LawAtlas-Dental hygienist - LawAtlas. Dental Hygienist Scope of Practice Laws Map.

15 Crosby 2012 - Crosby J. Dental therapists bridge gap. Star Tribune. 2012.