In many states, yes — placing dental sealants is an expanded function a trained dental assistant can perform, though it often sits at the expanded-function (EFDA) level and requires a board-approved course or permit.
Sealants are thin protective coatings applied to the chewing surfaces of back teeth to prevent decay.
The dentist examines and decides which teeth need them; a qualified assistant applies them.
Whether it's allowed, and what credential it takes, depends on your state.
The short answer
Placing sealants is a common expanded duty for dental assistants, and many states permit it — but as a trained, credentialed function rather than a basic one.
In a lot of states it's classified at the expanded-function (EFDA) level, meaning you need a board-approved course, and often a permit or exam, before you may place them.
Some states are more restrictive and reserve sealant placement for hygienists or dentists.
So the honest answer is "yes in many states, with the right credential" — and your state's rule is what settles it.
Sealant placement is an expanded function — verify your state's rule
What dental sealants are
A dental sealant is a thin, protective resin coating painted onto the chewing surfaces of the back teeth — the molars and premolars — where deep pits and grooves trap food and are hard to clean.
Once applied and hardened, the sealant seals out the bacteria and debris that cause decay.
Sealants are a preventive measure, most often placed for children and teens but used for adults too.
They don't treat existing cavities; they protect healthy teeth from developing them.
The expanded-function credential you usually need
Because placing sealants involves preparing the tooth surface and applying a material that stays on the tooth, most states treat it as an expanded function rather than a basic duty.
That typically means an EFDA-style credential or a specific sealant permit, earned through a board-approved course and sometimes an exam.
It's the same expanded-function tier that governs duties like coronal polishing.
For how these state permits relate to national certification, see our guide to CDA vs. RDA and the dental assistant title maze.
How placing a sealant works — and where the assistant's role starts
The dentist's part comes first: examining the patient and deciding which teeth should be sealed.
That diagnostic judgment stays with the dentist.
Where the state allows it, the trained assistant then carries out the placement — cleaning and preparing the tooth surface, applying the etchant and the sealant material, and curing it.
In many states the dentist checks the finished sealants.
What the assistant does not do is decide which teeth need sealing or diagnose decay — the assistant performs the application, not the diagnosis.
How the rules vary by state
The pattern mirrors other expanded functions: most states allow trained assistants to place sealants, but the required credential, whether a permit or exam applies, and the supervision level differ.
Many fold it into an EFDA pathway; some require a standalone sealant course; a minority reserve it for hygienists or dentists.
Treat any generalizations here as the range, not a checklist.
The only authority for your situation is your state's dental practice act, which can change — verify the current rule for your exact state before offering the service.
How to confirm your state's rule
Your state dental board lists the expanded functions assistants may perform and the course or permit each requires; the ADAA's state pages are a helpful starting map.
Where the two differ, the board is the authority.
Because sealant placement sits in the state-by-state expanded-function category, confirm your state's exact requirement before enrolling in a course or offering it, and note the date you checked — these rules are revised periodically.
This article is general career information, not legal or clinical advice. Expanded-function and scope-of-practice rules vary by state and change over time — confirm current requirements with your state dental board.