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100+ Free DANB COA Practice Questions

Pass your DANB Certified Orthodontic Assistant exam on the first try — instant access, no signup required.

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What is the function of a Nance holding arch in orthodontic treatment?

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2026 Statistics

Key Facts: DANB COA Exam

215

Total Questions

DANB COA page (OA 140 + ICE 75)

165 min

Exam Time

DANB COA page

$450

Exam Fee

2026 COA Application Packet

400

Passing Scaled Score

DANB scoring model (100-900 scale)

381,900

Dental Assistant Jobs (2024)

BLS

8%

Job Growth (2024-2034)

BLS

DANB lists the COA as a combined 215-question exam delivered in 165 minutes for $450. The OA component covers 140 questions in 105 minutes with four domains: Evaluation (21%), Radiation Health and Safety (18%), Orthodontic Procedures (35%), and Patient Education and Office Management (26%). The ICE component covers 75 questions in 60 minutes. DANB uses CAT scoring with a scaled pass score of 400 on a 100-900 scale. The 2026 application packet was updated on 11/12/2025.

Sample DANB COA Practice Questions

Try these sample questions to test your DANB COA exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which classification of malocclusion is characterized by a normal molar relationship with crowding or spacing of individual teeth?
A.Class I malocclusion
B.Class II malocclusion
C.Class III malocclusion
D.Class IV malocclusion
Explanation: Class I (Angle's) malocclusion features a normal mesiobuccal relationship of the first molars but includes individual tooth irregularities such as crowding, spacing, or rotations. It is the most common classification of malocclusion.
2What is the primary purpose of a cephalometric radiograph in orthodontic treatment planning?
A.To detect interproximal caries
B.To evaluate skeletal and dental relationships of the skull
C.To assess the periodontal ligament space
D.To visualize impacted third molars only
Explanation: A cephalometric (lateral skull) radiograph is used in orthodontics to analyze skeletal and dental relationships, including jaw size, position, and the relationship of teeth to their respective jaw bases. It is essential for diagnosis and treatment planning.
3Class II, Division 1 malocclusion is characterized by which of the following?
A.Mandibular incisors that are protruded
B.Maxillary incisors that are protruded (overjet)
C.A mesial shift of the mandibular first molar
D.An edge-to-edge incisor relationship
Explanation: In Class II Division 1, the maxillary incisors are protruded (excessive overjet), and the mandibular first molar is positioned distally relative to the maxillary first molar. This is the most common type of Class II malocclusion.
4Which orthodontic appliance is used to maintain the space created by premature loss of a primary tooth?
A.Hawley retainer
B.Space maintainer
C.Herbst appliance
D.Palatal expander
Explanation: A space maintainer is placed after premature loss of a primary tooth to hold the space open for the permanent successor. Without it, adjacent teeth may drift into the space, causing crowding and impaction of the permanent tooth.
5During bonding of orthodontic brackets, what is the purpose of applying acid etch to the enamel surface?
A.To whiten the tooth surface
B.To create microscopic irregularities for mechanical retention
C.To seal the enamel against demineralization
D.To sterilize the tooth surface
Explanation: Acid etching with phosphoric acid (typically 37%) creates microscopic porosities in the enamel surface. These irregularities allow the bonding adhesive to penetrate and form mechanical tags, providing retention for the orthodontic bracket.
6What is the typical etch time for phosphoric acid on permanent enamel when bonding orthodontic brackets?
A.5-10 seconds
B.15-30 seconds
C.60-90 seconds
D.2-3 minutes
Explanation: The standard etch time for phosphoric acid on permanent enamel is 15-30 seconds. Over-etching can weaken the enamel, while under-etching leads to inadequate mechanical retention and bracket failure.
7Which type of orthodontic wire is most commonly used in the initial alignment phase due to its superelastic properties?
A.Stainless steel
B.Nickel-titanium (NiTi)
C.Beta-titanium (TMA)
D.Cobalt-chromium
Explanation: Nickel-titanium (NiTi) wires are used in the initial alignment phase because of their superelastic properties and shape memory. They deliver light, continuous forces ideal for leveling and aligning crowded or malpositioned teeth.
8An orthodontic separator is placed between teeth primarily to accomplish which of the following?
A.Prevent food impaction during treatment
B.Create space for placement of orthodontic bands
C.Correct a crossbite
D.Close diastemas between anterior teeth
Explanation: Orthodontic separators (elastic or metal) are placed between teeth approximately one week before banding to create enough interproximal space for orthodontic bands to be seated. Without separators, bands would not fit over the contact areas.
9Which instrument is used to place and remove elastic ligature ties on orthodontic brackets?
A.Howe pliers
B.Mathieu pliers
C.Weingart utility pliers
D.Band-seating instrument
Explanation: Mathieu pliers (needle-holder style with a locking mechanism) are the instrument of choice for placing and removing elastic ligature ties around orthodontic brackets. Their lock feature allows controlled placement of the ties.
10What is the function of an orthodontic archwire?
A.To anchor the brackets to the tooth surface
B.To provide the force that moves teeth into desired positions
C.To separate teeth before band placement
D.To retain teeth after treatment completion
Explanation: The archwire is the active component of fixed orthodontic appliances. It is engaged into the bracket slots and provides the biomechanical force needed to move teeth along a planned path into their ideal positions.

About the DANB COA Exam

The DANB Certified Orthodontic Assistant (COA) credential combines two component exams: Orthodontic Assisting (OA) and Infection Control (ICE). It validates knowledge-based competence in orthodontic procedures, patient evaluation, radiation safety, and infection prevention for dental assistants working in orthodontic practice.

Questions

215 scored questions

Time Limit

2 hours 45 minutes

Passing Score

Scaled score 400 per component

Exam Fee

$450 (DANB / Pearson VUE)

DANB COA Exam Content Outline

140 questions (OA)

Orthodontic Assisting (OA)

Evaluation (21%), radiation health and safety (18%), orthodontic procedures (35%), patient education and office management (26%)

75 questions (ICE)

Infection Control (ICE)

Disease transmission prevention (20%), cross-contamination prevention (34%), instrument processing (26%), occupational safety (20%)

How to Pass the DANB COA Exam

What You Need to Know

  • Passing score: Scaled score 400 per component
  • Exam length: 215 questions
  • Time limit: 2 hours 45 minutes
  • Exam fee: $450

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

DANB COA Study Tips from Top Performers

1Prioritize orthodontic procedures — the largest OA domain at 35% of that component
2Study ICE domains in parallel with OA radiation safety since both cover infection prevention
3Practice identifying Angle classifications, bracket types, and orthodontic instruments visually
4Review OSHA Bloodborne Pathogens Standard and hazard communication requirements for ICE
5Use timed practice sets mixing OA and ICE questions to build stamina for the 165-minute exam

Frequently Asked Questions

How many questions are on the DANB COA exam?

DANB lists the combined COA exam at 215 questions total: 140 Orthodontic Assisting (OA) and 75 Infection Control (ICE).

How long is the DANB COA exam and how much does it cost?

DANB lists the COA exam at 165 minutes (2 hours 45 minutes) total with a 2026 exam fee of $450 for traditional candidates or $425 for active military.

What score do I need to pass the DANB COA?

DANB uses scaled scoring from 100 to 900. You must achieve a scaled score of at least 400 on each component exam (OA and ICE) to pass.

What are the COA eligibility pathways?

DANB offers four pathways: I) 3,500 hours work experience + CDA, II) high school + 3,500 hours, III) CODA orthodontic program + CDA, IV) former COA or dental degree. All pathways require current CPR/BLS/ACLS.

Can I take the OA and ICE exams separately?

Yes. DANB allows you to take the OA and ICE component exams separately or together. Both must be passed for COA certification.