Dental Assistant Requirements in Tennessee: Registration, X-Ray Rules & Allowed Duties

Tennessee's Board of Dentistry rules authorize two distinct levels of practice: a practical dental assistant, who works under a licensed dentist's direct supervision or is a student in an accredited program, and a registered dental assistant, who has received a registration from the Board.

A registered dental assistant may perform additional procedures for which the Board has certified them, under a dentist's direct supervision.

To practice beyond the scope of a practical dental assistant, an applicant must obtain a registration from the Board by submitting a completed application with the required fees, proof of a high school diploma or GED, proof of being at least eighteen years old, a passport-style photo, two character letters from dental professionals, proof of citizenship or legal residency, and a criminal background check, along with disclosure of any criminal convictions or prior licensing discipline.

The applicant must also submit evidence of current CPR training and pass the Board's Ethics and Jurisprudence examination.

The rules require dental assistants to work under a licensed dentist's direct supervision but do not define the term itself in these chapters.

A dentist may delegate procedures only when exercising direct supervision and full responsibility.

Coronal polishing has the strictest spelled-out standard: the supervising dentist must be physically on the office premises at all times during the polishing and must examine the patient immediately before and after.

Sealant application requires direct supervision and that same immediate before-and-after exam, but the rule does not add coronal polishing's on-premises requirement.

Beyond duties commonly recognized by the dental profession as safe for assistants, the rule lists specific procedures a practical or registered dental assistant may perform when assigned or delegated by the supervising dentist.

These include processing radiographs (including digital), applying topical fluoride, taking vital signs and charting oral conditions, placing and removing matrices, rubber dam and temporary restorations, taking alginate impressions other than for permanent restorations, orthodontic wire and band tasks, placing amalgam for the dentist to condense, applying topical anesthetics and desensitizing agents, placing cavity liners and bases, taking oral cytologic smears, performing pulp testing, packing pulpotomy paste, demonstrating oral hygiene, calling in prescriptions as instructed, wound care as directed, and any other duty the Board specifically approves at a regular meeting.

Processing radiographs, including digital images, is on the general delegable-duties list open to any practical or registered dental assistant.

Exposing, meaning taking, dental radiographs is different: it requires a registered dental assistant to also hold the Board's Dental Radiology Certification, and the rule expressly prohibits exposing radiographs without that certification.

To earn the certification, the assistant must already be registered, then complete a Board-approved dental radiology course, an equivalent out-of-state course, or have passed the radiology portion of the DANB exam, after which the certification is added to the registration and stays valid only while the registration is current.

In addition to duties defined elsewhere as the practice of dentistry or dental hygiene, the rule bars dental assistants from examination, diagnosis and treatment planning; surgical or cutting procedures on hard or soft tissue including laser, air abrasion or micro-abrasion, curettage or root planing; fitting, adjusting or placing prosthodontic appliances; issuing prescriptions or unauthorized medications; direct pulp capping, pulpotomy and other unauthorized endodontic procedures; approving final occlusion; placing sutures; administering local anesthesia, nitrous oxide, conscious sedation or general anesthesia; and using a high-speed handpiece intraorally.

It also bars monitoring nitrous oxide, coronal polishing, applying sealants, exposing radiographs, or performing expanded restorative or prosthetic functions without the specific certification each requires.

Dental assistants may not administer nitrous oxide to patients, but a registered dental assistant may monitor nitrous oxide sedation after becoming certified.

To qualify, the assistant must already be registered, then complete a Board-approved nitrous oxide monitoring course, an equivalent out-of-state course, or be enrolled in one as part of an accredited program's curriculum.

Once certified, the assistant may monitor only one patient at a time, must physically remain with that patient, and may only adjust the dosage or terminate the nitrous oxide at the supervising dentist's specific direction or during patient distress, never administer it.

A registration must be renewed by the expiration date set by the practitioner's birthday, with a completed renewal application, the renewal and state regulatory fees, and proof of passing the Ethics and Jurisprudence examination.

Reinstating an expired registration additionally requires documentation of completed continuing education for the entire lapsed period.

A registrant who wants to keep a registration without practicing may instead file for retirement, which excuses them from the renewal process and from continuing education and CPR requirements until they reactivate.

Beyond registration itself, a registered dental assistant can add certifications in coronal polishing, sealant application, and expanded restorative or prosthetic functions, each earned through a Board-approved course, an equivalent out-of-state course, or inclusion in an accredited program's curriculum, and each valid only as long as the underlying registration stays current.

Coronal polishing requires the dentist to be physically on the premises throughout, plus an exam immediately before and after; sealant application requires only direct supervision and that same before-and-after exam.

Restorative and prosthetic certification holders still may not diagnose restoration or prosthetic need, cut or modify tooth or soft tissue, remove caries, establish vertical dimension of occlusion, or use a high-speed handpiece intraorally.