Dental Assistant Requirements in Massachusetts: Registration, X-Ray Rules & Allowed Duties
Massachusetts sets no stand-alone registration or license for dental assistants.
Board rule 234 CMR 2.02 instead defines four categories a dentist may rely on — Certified Assistant, Dental Assistant Trained on the job, Expanded Function Dental Assistant, and Formally Trained Dental Assistant — each qualified through training, a formal program, or Dental Assisting National Board certification.
A table at 234 CMR 5.11 sets, procedure by procedure, which category may perform it and under what supervision level.
Radiographs require a training course, and an on-the-job trained assistant must also pass a radiation-safety exam.
Verify before you rely on this
At a glance
Entry-level assistant
Registration
Not required
Certified Assistant (CA)
Credential levels
4
Verified September 2026
Regulated by
Massachusetts Board of Registration in Dentistry
The Short Version
- Registration or licensure
- 234 CMR 2.02 defines the four dental assistant categories by education, training, a formal program, or certification, rather than by a state registration process, and 234 CMR sets out no stand-alone registration requirement for a dental assistant.
- Taking x-rays
- Under 234 CMR 5.09, a Certified Assistant, Formally Trained Dental Assistant or Expanded Function Dental Assistant may take dental radiographs under a dentist's supervision only after completing a course with a curriculum that meets CODA standards for radiological techniques and safeguards, while an on-the-job trained assistant must complete a course in radiological techniques and safeguards and pass a radiation health and safety exam within one year of finishing that course.
- Credential titles the state uses
- Certified Assistant (CA) · Dental Assistant Trained on the job (OJT) · Expanded Function Dental Assistant (EFDA) · Formally Trained Dental Assistant (FTDA)
The four dental assistant categories Massachusetts defines
234 CMR 2.02 defines a dental assistant as an individual who, under a licensed dentist's supervision, aids or assists the dentist in dental-care procedures or duties.
The rule sets out four categories: a Certified Assistant, certified by the Dental Assisting National Board or another Board-approved certifying body; a Dental Assistant Trained on the job, trained on the job by a licensed dentist under M.G.L. c. 112, § 51½; an Expanded Function Dental Assistant, nationally certified and a graduate of a CODA-accredited expanded-functions program; and a Formally Trained Dental Assistant, a graduate of a school or program that meets the licensure requirements of 234 CMR 4.11(3).
Dental Assistant. An individual qualified by education, training or experience who, under the supervision of a licensed dentist, aids or assists the dentist in the performance of procedures or duties related to the provision of dental care in accordance with the provisions in 234 CMR 2.00. A dental assistant may be classified in one of four categories:
No stand-alone registration — categories run on training and certification
234 CMR does not set out a stand-alone state registration or license for a dental assistant.
A person instead qualifies for a category under 234 CMR 2.02 by education, training, a formal program, or certification: a Certified Assistant through Dental Assisting National Board certification or another Board-approved certifying body; an on-the-job trained assistant through employer-provided training under a licensed dentist per M.G.L. c. 112, § 51½; a Formally Trained Dental Assistant by graduating a program that meets the licensure requirements of 234 CMR 4.11(3); and an Expanded Function Dental Assistant through national-board certification plus a CODA-accredited expanded-functions program covering the 234 CMR 5.11 duties.
(b) Dental Assistant Trained on the job (OJT) means an individual trained on the job by a dentist licensed to practice dentistry in the Commonwealth who has completed the training pursuant to M.G.L. c. 112, § 51½.
What General, Direct and Immediate supervision mean here
234 CMR 2.02 defines three supervision types.
General supervision runs on a licensed dentist's instructions and does not require the dentist's physical presence while the procedure is performed.
Direct supervision requires the dentist to remain in the dental facility while the auxiliary performs the procedure.
Immediate supervision requires the dentist to remain in the facility, personally diagnose the condition, personally authorize the procedure, and evaluate the treatment before the patient leaves.
The 5.11 table assigns one of these types, or bars delegation outright, to each procedure for each assistant category.
(b) Direct Supervision means supervision of dental procedures based on instructions given by a licensed dentist who remains in the dental facility while the procedures are being performed by the auxiliary. (c) Immediate Supervision means the supervision of dental procedures by a licensed dentist, who remains in the dental facility, personally diagnoses the condition to be treated, personally authorizes the procedures, and before dismissal of the patient, evaluates the treatment rendered.
What each category may do — the 234 CMR 5.11 table
234 CMR 5.10 lets a dentist delegate dental duties to a properly trained dental auxiliary and holds the dentist responsible for every delegated act. 234 CMR 5.11 then tables 71 specific procedures, assigning each a supervision level — General, Direct, Immediate, or Delegation Not Allowed — for a Certified Assistant, Formally Trained Dental Assistant, Expanded Function Dental Assistant and on-the-job trained assistant.
Oral health instruction, fluoride varnish and topical anesthetic run under General supervision for the first three categories but only Direct supervision for an on-the-job trained assistant, and dental sealants are Direct supervision for a Certified or Formally Trained Dental Assistant but not delegable to an on-the-job trained assistant at all.
(1) A dentist licensed to practice dentistry in the Commonwealth pursuant to M.G.L. c. 112, § 45 may delegate certain dental duties set forth in this section to a dental auxiliary who is properly educated, trained, and qualified as specified in M.G.L. c 112, §§ 43 through 53, 61 and 234 CMR and any rule, advisory or written policy adopted by the Board related to the practice of dentistry, dental hygiene, or dental assisting. (2) The supervising dentist shall be responsible for all delegated acts and procedures performed by the dental auxiliary. Any dentist who delegates a procedure to an auxiliary who does not meet the requirements necessary to perform that procedure may be subject to disciplinary action by the Board.
Taking x-rays
234 CMR 5.11(8) lists exposing radiographs as a General-supervision duty for every assistant category the table covers, including an on-the-job trained assistant. 234 CMR 5.09 sets the training that comes first: a Certified Assistant, Formally Trained Dental Assistant or Expanded Function Dental Assistant may take radiographs under a dentist's supervision only after completing a course with a curriculum meeting CODA standards for radiological techniques and safeguards; an on-the-job trained assistant must complete a course in radiological techniques and safeguards and pass a radiation health and safety exam within one year of completing the course.
(2) An On-the-job Trained Dental Assistant (OJT) may take radiographs only under the supervision of a dentist and must have completed a course in radiological techniques and safeguards and successfully passed the DANB Radiation Health and Safety Examination (RHS), or other examination as approved by the Board, within one year of the course completion.
Duties only a licensed dentist may perform
234 CMR 5.12 reserves ten acts to a licensed dentist alone: performing final diagnoses and treatment planning; surgical or cutting procedures on hard or soft tissue; prescribing or parenterally administering drugs; prescribing dental lab work orders for an appliance, prosthetic device or restoration; operating high-speed rotary instruments in the mouth; performing pulp-capping procedures; taking final impressions for fixed or removable prosthetic restorations; final positioning and attachment of orthodontic bonds and bands; final cementation of crowns and bridges; and irrigating root canals.
Only licensed dentists shall: (1) Perform final diagnoses and treatment planning; (2) Perform surgical or cutting procedures on hard or soft tissue;
Nitrous oxide monitoring and local anesthesia
234 CMR 5.11(25) lists assisting or monitoring nitrous oxide analgesia as an Immediate-supervision duty across the table, including for a Certified Assistant, Formally Trained Dental Assistant, Expanded Function Dental Assistant and on-the-job trained assistant — meaning the supervising dentist must remain in the facility, have personally diagnosed and authorized the procedure, and evaluate the treatment before the patient leaves.
Administering local anesthesia is marked Delegation Not Allowed for all four assistant categories at 5.11(45); only a Registered Dental Hygienist or Public Health Dental Hygienist may perform it, under Direct supervision, pursuant to 234 CMR 6.00.
(25) Assist or monitor nitrous oxide analgesia I I I I I I
Frequently Asked Questions
Do I need to register or get a license to work as a dental assistant in Massachusetts?
No. 234 CMR 2.02 sets out no stand-alone state registration or license for a dental assistant.
Instead, the rule defines four categories — Certified Assistant, Dental Assistant Trained on the job, Expanded Function Dental Assistant, and Formally Trained Dental Assistant — each qualified through employer training, a formal program, or Dental Assisting National Board certification.
A dentist confirms an assistant meets a category's requirements before delegating any procedure.
Confirm current category requirements with the Massachusetts Board of Registration in Dentistry.
Can a dental assistant take x-rays in Massachusetts?
Yes, once trained. 234 CMR 5.11 lists exposing radiographs as a General-supervision duty for every assistant category.
Before that, 234 CMR 5.09 requires a Certified Assistant, Formally Trained Dental Assistant or Expanded Function Dental Assistant to complete a course meeting CODA standards for radiological techniques and safeguards, while an on-the-job trained assistant must also complete that course and pass the Dental Assisting National Board's Radiation Health and Safety Examination, or another exam the Board approves, within one year.
Verify current exam options with the Massachusetts Board of Registration in Dentistry.
Does the dentist have to be in the room while a dental assistant works?
It depends on the task's supervision level. 234 CMR 2.02 defines General supervision as running on a licensed dentist's instructions without requiring the dentist's physical presence during the procedure.
Direct supervision requires the dentist to remain in the dental facility while the procedure is performed.
Immediate supervision requires the dentist to remain in the facility, personally diagnose and authorize the procedure, and evaluate the treatment before the patient leaves.
The 234 CMR 5.11 table assigns each delegable duty a General, Direct or Immediate supervision level, or bars delegation outright.
Ask the Massachusetts Board of Registration in Dentistry with questions.
What can a dental assistant never do in Massachusetts?
234 CMR 5.12 reserves ten acts to a licensed dentist alone, including final diagnoses and treatment planning, surgical or cutting procedures on hard or soft tissue, prescribing or parenterally administering drugs, prescribing dental lab work orders for an appliance or prosthetic device, operating high-speed rotary instruments in the mouth, pulp-capping, taking final impressions for fixed or removable prosthetic restorations, final positioning of orthodontic bonds and bands, final cementation of crowns and bridges, and irrigating root canals.
Confirm a specific task with the Massachusetts Board of Registration in Dentistry.
How does someone become an Expanded Function Dental Assistant in Massachusetts?
234 CMR 2.02 defines an Expanded Function Dental Assistant as an individual currently certified by the Dental Assisting National Board or another Board-approved certifying body who has also completed a formal expanded-functions program, at a CODA-accredited program, covering at minimum the delegable duties in 234 CMR 5.11.
That certification and program are what let a dentist delegate the broader General-supervision duties the 5.11 table reserves to an Expanded Function Dental Assistant and Certified Assistant.
Confirm current program options with the Massachusetts Board of Registration in Dentistry.
Who regulates dental assistants in Massachusetts?
Dental Assistants in Massachusetts are regulated by the Massachusetts Board of Registration in Dentistry.
The rules on this page come from the state's own statute and board rules as published on the dates shown; they change over time, so verify current requirements with the board before relying on them.
More Massachusetts & Dental Assistant Resources
Sourced from 234 CMR 5.00: Requirements for the Practice of Dentistry, Dental Hygiene, and Dental Assisting (Board of Registration in Dentistry) — dental-assistant sections 5.04, 5.05, 5.09, 5.10, 5.11, 5.12 (MA REG. #1271, Dated 10-10-14); 234 CMR 2.00: Purpose and Definitions (Board of Registration in Dentistry) — 2.02 Definitions holds the dental assistant categories and supervision terms (MA REG. # 1363, Dated 4-20-18). Verified September 2026. This page summarizes the state's own statute and board rules as published on the dates shown. It is general information, not legal advice, and rules change: confirm anything you intend to rely on with the state dental board before acting on it.