- NELDA is three separately scored components: AMP (80 Q, 60 min), ICE (75 Q, 60 min), RHS (75 Q, 60 min).
- Each component needs a scaled score of 400 on a 100-900 scale - passing one doesn't carry over to another.
- Combined fee is USD 400 (USD 380 for eligible active military), including the USD 75 nonrefundable application fee.
- Tooth Anatomy carries 60% of AMP; Cross-contamination carries 34% of ICE; Purpose/Technique carries 50% of RHS.
Exam Snapshot: Format, Fees, Timing
Before you dive into review sheets, lock in the mechanical facts about the National Entry Level Dental Assistant exam. NELDA is administered by the Dental Assisting National Board (DANB), and the combined version is delivered at Pearson VUE test centers. (The individual AMP, ICE, and RHS component exams also offer remote-proctored delivery for candidates who take them separately, but the combined NELDA sitting is test-center only.)
The combined exam costs USD 400, or USD 380 for eligible active military candidates, and that price already includes the USD 75 nonrefundable application fee. If you're comparing this to component-by-component pricing, AMP alone is USD 245, ICE alone is USD 270, RHS alone is USD 270, and the RHS/ICE combination is USD 375 - details worth reviewing in a full NELDA certification cost breakdown if you're deciding between the combined exam and separate components.
The Three Components at a Glance
NELDA isn't one continuous test - it's three computer-adaptive, independently scored components bundled into a single exam appointment. Each has its own question count, time limit, and passing threshold.
| Component | Questions | Time | Domains Covered |
|---|---|---|---|
| AMP (Anatomy, Morphology and Physiology) | 80 | 60 minutes | Domains 1-2 |
| ICE (Infection Control) | 75 | 60 minutes | Domains 3-6 |
| RHS (Radiation Health and Safety) | 75 | 60 minutes | Domains 7-9 |
Because each component is scored separately against a scaled passing score of 400 (on a 100-900 scale), you can pass two components and need a retake on only the third - you don't have to redo the whole thing. For a deeper dive into how scoring actually works, see the NELDA passing score guide.
Domain-by-Domain Cheat Sheet
Each component's questions are pulled from specific domains, and within each component, some domains are weighted far more heavily than others. Memorize these weights so your study time matches the actual exam blueprint rather than an even split.
Domain 1: Head, Neck and Oral Cavity (40% of AMP)
Covers oral and facial anatomy landmarks, structures, and their clinical relevance.
- Know major bones, muscles, and landmarks of the head and neck
Domain 2: Tooth Anatomy, Morphology and Physiology (60% of AMP)
The single largest local weight on the entire exam. Tooth numbering, surfaces, eruption patterns, and morphology dominate AMP.
- Universal Numbering System, tooth surfaces, and primary vs. permanent dentition are must-know territory
Domain 3: Prevention of Disease Transmission (20% of ICE)
Modes of transmission and standard precautions in the dental setting.
- Focus on bloodborne pathogen basics and chain-of-infection concepts
Domain 4: Prevention of Cross-contamination (34% of ICE)
The heaviest-weighted ICE domain. Barrier techniques, surface disinfection, and PPE protocols live here.
- Practice scenario questions about proper sequencing of PPE removal and surface barriers
Domain 5: Process Instruments and Devices (26% of ICE)
Sterilization cycles, packaging, and monitoring of instruments.
- Know the difference between disinfection and sterilization, and common monitoring methods
Domain 6: Occupational Safety and Administration Protocols (20% of ICE)
OSHA-related recordkeeping, exposure control plans, and hazard communication.
- Review exposure incident reporting steps
Domain 7: Purpose and Technique (50% of RHS)
The dominant RHS domain - radiographic technique, positioning, and rationale for imaging.
- Digital radiography is explicitly covered, alongside traditional film concepts
Domain 8: Radiation Characteristics and Protection (25% of RHS)
Radiation biology, dose limits, and protective measures for patients and staff.
- Know ALARA principles and shielding basics
Domain 9: Infection Prevention and Control (25% of RHS)
Infection control as it applies specifically to the radiography workflow.
- Barrier techniques for sensors, PSPs, and equipment surfaces
Remember that these percentages apply within each component only - not across the combined 230-question exam. For a full walkthrough of every domain with sample question styles, see the complete guide to all 9 NELDA content areas.
Passing Score and Testing Window Rules
Two timing rules trip up candidates more than any content topic:
- 60-day testing window: once your eligibility is approved, you have a defined window to schedule and sit for your components.
- Three-year rule: all three components (AMP, ICE, RHS) must be passed within three years of each other. Pass AMP in year one, then run out of time before RHS, and you may need to retake components.
Each component requires a scaled score of 400 on the 100-900 scale - there's no combined or averaged score across AMP, ICE, and RHS. DANB's 2025 all-candidate pass rates by component were AMP 60%, ICE 75%, and RHS 69%, but these are component-level figures, not a single "NELDA pass rate." For context on how these numbers should shape your prep priorities, read the NELDA pass rate breakdown and the companion NELDA difficulty guide.
Key Takeaway
AMP has the lowest component pass rate of the three - budget extra review time for tooth anatomy and morphology rather than assuming all three components need equal attention.
Eligibility Pathways Recap
NELDA eligibility documentation is submitted after you pass all three components, not before you sit for them. You'll need one of these qualifying pathways:
- An accepted non-CODA postsecondary dental assisting program, plus high-school completion or equivalency
- Job Corps dental assisting program graduation
- An accepted high-school dental assisting program
- High-school completion or equivalency plus 300-3,000 dentist-verified dental assisting work hours, accrued over two months to three years
You'll also need current, DANB-accepted hands-on CPR, BLS, or ACLS certification as part of the overall requirement - this applies both at initial certification and at every renewal.
Renewal and Recertification Facts
NELDA isn't a one-time credential you earn and forget. Annual renewal requires:
- Six continuing dental education (CDE) credits per year
- Three of those six credits specifically in infection control
- Within those three infection-control credits, one must cover bloodborne pathogens
- Current accepted hands-on CPR/BLS/ACLS
- A USD 50 renewal fee
You can renew a maximum of three times, meaning the certification can be held for up to four years total before further action is required. Build these renewal deadlines into your calendar the same way you'd track exam dates - see the NELDA exam dates and scheduling guide for how testing windows and renewal cycles interact.
Last-Week Review Plan
If you're using this cheat sheet in the final week before your test date, don't try to relearn everything - triage by weight. Spend the most time where the exam spends the most questions.
AMP Heavy Hitters
- Drill tooth anatomy, numbering, and morphology - the 60%-weighted domain
- Skim head/neck landmarks for Domain 1 recognition questions
ICE Priorities
- Focus on cross-contamination scenarios (34% of ICE)
- Review instrument processing and sterilization monitoring
RHS Priorities
- Review radiographic purpose/technique questions (50% of RHS), including digital radiography
- Refresh radiation protection principles and dose concepts
Logistics and Light Review
- Confirm test-center appointment, ID requirements, and arrival time
- Run a timed practice set on the main practice test platform instead of cramming new material
For a longer runway rather than a final-week cram, the NELDA study guide for first-attempt success lays out a multi-week structure built around these same domain weights.
Quick Reference Table
| Fact | Detail |
|---|---|
| Certifying body | Dental Assisting National Board (DANB) |
| Delivery (combined exam) | Pearson VUE test center |
| Combined fee | USD 400 (USD 380 active military), includes USD 75 application fee |
| Total questions / time | 230 questions / 180 minutes |
| Passing score | 400 scaled score (100-900 scale) per component |
| Testing window | 60 days |
| Time limit to pass all 3 | 3 years |
| Renewal cycle | Annual, USD 50, 6 CDE credits (3 infection control, 1 bloodborne pathogens) |
| Max renewals | 3 (4 years total holding NELDA) |
Once you're certified, dental practices, group dental clinics, and other outpatient oral-care settings look for the NELDA credential as a baseline hiring signal for entry-level chairside roles - see NELDA jobs for where the credential opens doors, and the NELDA salary guide for how compensation is discussed. If you're still weighing whether to pursue it at all, the ROI analysis on NELDA certification walks through the cost-versus-benefit case.
Frequently Asked Questions
No. They are separately scored components, and you have three years from your first passed component to pass the remaining ones. You do need to schedule within your 60-day testing window once eligibility is approved.
You only need to retake the component(s) you didn't pass, as long as you complete all three within the three-year limit. Each component keeps its own scaled score of 400 as the passing threshold.
Eligibility documentation is submitted after you pass all three NELDA components, not beforehand. You can sit for the exam first and gather your qualifying-pathway paperwork afterward.
Within each component, prioritize the highest-weighted domain: Tooth Anatomy, Morphology and Physiology (60% of AMP), Prevention of Cross-contamination (34% of ICE), and Purpose and Technique (50% of RHS).
You can renew annually up to three times, for a total of four years holding the credential, provided you complete the required six CDE credits (including three in infection control with one bloodborne-pathogens credit) and pay the USD 50 renewal fee each year.