This free DANB CDA study guide walks through the highest-yield content tested across the three component exams from the — , , and — organized by the official DANB exam outlines.[1]
The CDA is not a single test. You earn it by passing all three component exams, so this guide is built as three study modules — one per component — taught the way each is actually tested: tooth anatomy and four-handed chairside skills for GC, sterilization and PPE for ICE, and radiographic technique and radiation protection for RHS.
Read it component by component, then round out your prep with our practice questions and flashcards. The CDA is awarded by the to candidates who meet an eligibility pathway, hold current CPR, and pass GC, RHS, and ICE within a five-year period.
DANB CDA Exam Snapshot
| Component exam | Scored items | Time | Passing score |
|---|---|---|---|
| General Chairside Assisting (GC) | 95 multiple-choice | 75 minutes | Scaled 400 (range 100–900) |
| Radiation Health & Safety (RHS) | 75 multiple-choice | 60 minutes | Scaled 400 (range 100–900) |
| Infection Control (ICE) | 75 multiple-choice | 60 minutes | Scaled 400 (range 100–900) |
You must pass all three components to earn the CDA, but each is scored independently and you only retake the one you fail (within the five-year window).[1] The exams are computer-adaptive and criterion-referenced, delivered by Pearson VUE at a test center or by online remote proctoring; they can be taken together in one appointment or separately.
| Detail | DANB CDA |
|---|---|
| Credential | Certified Dental Assistant (CDA), awarded by DANB |
| Structure | Three component exams — GC, RHS, ICE — all passed within 5 years |
| Scoring | Computer-adaptive; scaled 100–900; passing standard 400 on each |
| Delivery | Pearson VUE test center or OnVUE online remote proctoring |
| Eligibility | CODA-accredited program, OR HS + ~3,500 hours' experience, OR prior DANB/dental-school path; current CPR (verify on the DANB packet) |
| Exam fee | ~270 per component) — dated anchor; verify on the DANB application |
| Recertification | Annual: 12 CDE credits per year + renewal fee (~$75) for a single cert; maintain CPR |
How the Three Components Work
The single most important thing to understand about the CDA is its structure. Unlike a one-and-done certification, the CDA is built from three separate exams, each with its own content outline, item count, and time limit. This guide teaches all three as three study modules so the structure matches DANB exactly.[1]
- General Chairside Assisting (GC) — 95 items, 75 minutes. The broadest, most clinical component: evaluation, chairside dentistry, dental materials, and administration. Effective July 1, 2022.
- Radiation Health & Safety (RHS) — 75 items, 60 minutes. Dental imaging technique, radiation characteristics and protection, and infection control during imaging. Tests digital radiography only. Effective March 12, 2025.
- Infection Control (ICE) — 75 items, 60 minutes. Disease-transmission prevention, cross-contamination control, instrument processing, and occupational safety. Effective March 12, 2025.
Each component is scored on a from 100 to 900, and a 400 passes each. Because the exams are computer-adaptive, questions get harder as you answer correctly — so a test that feels difficult is not a sign you are failing. Eligibility (the pathways and CPR) attaches to the GC exam; RHS and ICE have no separate eligibility requirement.[1]
General Chairside Assisting (GC)
The component is 95 items in 75 minutes and is the broadest of the three. DANB organizes it into four content areas, weighted as follows.[1]
Evaluation: Anatomy, Charting & Vital Signs
Evaluation (17%) covers the preliminary patient workup: head, neck, and oral anatomy, tooth anatomy and numbering, charting, , and recognizing medical emergencies. Tooth numbering is high-yield — the U.S. standard is the , which numbers the 32 permanent teeth 1–32, starting at the maxillary right third molar (#1) and ending at the mandibular right third molar (#32).[6]
Know the tooth surfaces — (toward the midline), (away from the midline), facial/buccal/labial, lingual, and (the chewing surface) — because they drive both charting and cavity classification. Vital signs establish a baseline before treatment.[6]
| Vital sign | Normal adult range | Note |
|---|---|---|
| Pulse (heart rate) | 60–100 beats/min | Below 60 = bradycardia; above 100 = tachycardia |
| Respiration | 12–20 breaths/min | Count discreetly so the patient doesn't alter breathing |
| Blood pressure | < 120/80 mmHg | Top = systolic (contraction); bottom = diastolic (rest) |
| Temperature | ~98.6°F (37°C) | Fever generally ≥ 100.4°F (38°C) |
Chairside Dentistry & Four-Handed Technique
Chairside Dentistry is half the GC exam (50%) — the single biggest block on any CDA component.[1] It centers on : seated, coordinated team care where the assistant anticipates needs and passes instruments in the transfer zone (below the patient's chin, out of sight) so the operator never looks away from the field. The assistant also runs high-volume evacuation, maintains a dry field, and prepares the correct tray setup for each procedure.[1]
Restorations are heavily tested. For an amalgam, the assistant prepares the (a Tofflemire band and a wedge to restore the missing wall), then transfers the amalgam carrier, condenser, carver, and burnisher in sequence. For a , the enamel is first treated with an (about 37% phosphoric acid), then a bonding agent is applied and the composite is placed and light-cured in thin increments.[6]
| Class | Location |
|---|---|
| Class I | Pits and fissures (occlusal surfaces of posterior teeth, lingual pits) |
| Class II | Proximal (mesial/distal) surfaces of posterior teeth |
| Class III | Proximal surfaces of anterior teeth (not the incisal edge) |
| Class IV | Proximal surfaces of anterior teeth involving the incisal edge |
| Class V | Gingival (cervical) third of the facial or lingual surface of any tooth |
| Instrument | Use |
|---|---|
| Amalgam carrier | Carries and dispenses amalgam into the prepared cavity |
| Condenser (plugger) | Packs/condenses amalgam firmly into the preparation |
| Carver (e.g., discoid-cleoid) | Shapes and contours amalgam to anatomy after condensation |
| Burnisher | Smooths and adapts the surface/margins of amalgam |
| Curing light | Hardens (polymerizes) light-cured composite resin |
| Spoon excavator | Removes soft, decayed dentin from a preparation |
Dental Materials
Dental Materials (16%) covers impression, operative, and laboratory materials.[1] Know (strong, silver-colored, for posterior teeth) versus (tooth-colored, bonded, esthetic); alginate (an irreversible hydrocolloid for preliminary impressions and study models); and the role of liners, bases, and cements. A liner is a thin layer that protects the pulp, a base is thicker and insulates/supports, and a cement is a luting agent that bonds restorations such as crowns.
Patient Management & Administration
Patient Management & Administration (17%) covers behavior management, oral health education, legal records, inventory and equipment maintenance, and the regulatory framework — OSHA, CDC, and HIPAA.[1] The dental record is a legal document: chart accurately, completely, and contemporaneously, and never alter it improperly. HIPAA requires that protected health information be shared only on a need-to-know basis for the patient's care.[4]
Checkpoint · General Chairside Assisting (GC)
Question 1 of 10
When recording a patient's blood pressure of 138/88 mmHg, which number represents the diastolic pressure?
Infection Control (ICE)
The component is 75 items in 60 minutes.[1] It is detail-focused and rule-based, built on one idea: — treating every patient's blood and body fluids as potentially infectious. DANB organizes it into four content areas.[3]
Preventing Disease Transmission & PPE
Disease transmission requires a chain of links — a pathogen, a source/reservoir, a portal of exit, a mode of transmission, a portal of entry, and a susceptible host — and breaking any link stops it. is the single most effective measure, performed before and after every patient. An alcohol-based hand rub is acceptable when hands are not visibly soiled; wash with soap and water when they are.[3]
is donned and doffed in a specific order so the most contaminated items come off without spreading contamination.[3]
- 1Gown
- 2Mask
- 3Eyewear / face shield
- 4Gloves
- 1Gloves
- 2Eyewear / face shield
- 3Gown
- 4Mask
Preventing Cross-Contamination
Cross-contamination control is the largest ICE area (34%).[1] It includes surface barriers (disposable covers changed between patients), the clean-then-disinfect rule for surfaces (you cannot disinfect a dirty surface), dental unit waterline maintenance, and the safe handling of biohazardous waste. Use an EPA-registered hospital disinfectant and observe its full contact (kill) time.[3]
| Item type | What you do |
|---|---|
| Clinical contact surfaces (light handle, counter) | Barrier-cover or clean then disinfect between patients |
| Critical/semicritical instruments | Sterilize (heat) — disinfection is not enough |
| Noncritical equipment (BP cuff) | Intermediate- or low-level surface disinfection |
| Dental unit waterlines | Treat/flush so water meets CDC quality standards |
Processing Instruments & Devices
Instrument processing (26%) follows a strict one-direction workflow from contaminated to clean to sterile.[3] The decides how each item is reprocessed based on the tissue it contacts, and — most commonly the steam — must be verified with monitoring.
Carry used instruments to the processing area in a covered, leak-proof container — keep them moist with a holding solution so debris doesn't dry on.
Remove all bioburden in an ultrasonic cleaner or instrument washer (preferred over hand-scrubbing). You cannot sterilize a dirty instrument.
Dry, then wrap/pouch instruments with an internal chemical indicator before sterilizing so sterility is maintained until use.
Most commonly steam under pressure (autoclave). Load loosely so the sterilant reaches every surface; run the full validated cycle.
Verify with mechanical, chemical, AND biological (spore) indicators. A weekly spore test is the only true proof the sterilizer kills spores.
Keep dry, sealed packages in clean, closed storage; a torn or wet package is no longer sterile and must be reprocessed.
Occupational Safety & OSHA
Occupational safety (20%) is governed by OSHA's Standard and Hazard Communication Standard.[4] The three bloodborne pathogens of greatest concern are HBV, HCV, and HIV; the hepatitis B vaccine must be offered to at-risk employees at no cost.
Used are never recapped by hand and go directly into a puncture-resistant container. Every office must keep a written, annually reviewed .[4]
Checkpoint · Infection Control (ICE)
Question 1 of 10
Which term describes the spread of microorganisms from one surface, instrument, or person to another in the dental setting?
Radiation Health & Safety (RHS)
The component is 75 items in 60 minutes and tests digital radiography only.[1] DANB organizes it into three content areas: Purpose and Technique (50%), Radiation Characteristics and Protection (25%), and Infection Prevention and Control during imaging (25%).
Purpose, Technique & Image Errors
Purpose and Technique is half the RHS exam.[1] It covers image types (periapical, , occlusal, panoramic, and CBCT), the two intraoral techniques, image mounting, and — heavily tested — recognizing and correcting exposure errors. The (receptor parallel to the tooth, central ray perpendicular to both) is preferred for accuracy; the aims the central ray at the bisector of the angle between tooth and receptor.[5]
The most-confused error pair is versus . Remember: too flat = too long, too steep = too short. comes from horizontal-angulation error, and a comes from a mis-centered position-indicating device.[5]
| Radiograph | Best for |
|---|---|
| Bitewing | Interproximal caries and crestal (alveolar) bone height |
| Periapical | The whole tooth, root apex, and surrounding bone |
| Panoramic | Both arches, jaws, TMJs, and sinuses on one extraoral image |
| Occlusal | A broad area of the maxilla or mandible (patient bites the receptor) |
Radiation Characteristics & Protection
This area (25%) covers radiation physics and biology and how to protect patients and operators. The guiding principle is — As Low As Reasonably Achievable — put into practice through time, distance, and shielding.[5] Cells that are young, rapidly dividing, and undifferentiated are the most radiosensitive, which is why the radiosensitive thyroid is shielded with a collar.
| Item | Detail |
|---|---|
| Absorbed dose (SI) | Gray (Gy) — traditional unit: rad |
| Dose equivalent (SI) | Sievert (Sv) — traditional unit: rem |
| Operator MPD (occupational) | 50 mSv (5 rem) per year |
| Operator position (no barrier) | ≥ 6 feet away, at 90–135° to the primary beam |
| Patient shielding | Lead apron + thyroid collar (no collar for panoramic) |
| Lower patient dose | Fastest receptor, rectangular collimation, no retakes |
Infection Control in Imaging
A full quarter of RHS (25%) is infection control applied to imaging.[1] The same standard precautions from the ICE component apply: barrier-cover the tube head, control panel, and sensors; wear gloves; disinfect or barrier surfaces between patients; and handle digital sensors and their sheaths to prevent cross-contamination. Knowing this overlap means studying ICE strengthens RHS too.[3]
Checkpoint · Radiation Health & Safety (RHS)
Question 1 of 10
Which intraoral radiographic technique positions the receptor parallel to the long axis of the tooth with the central ray directed perpendicular to both?
How to Use This Study Guide
Work through the guide one component at a time. After each, check it off in the contents to raise your exam-readiness score, then drill the same content in our free practice questions and flashcards — active recall and timed practice are what move knowledge into exam-day performance.
- 1
Step 1
Start with General Chairside (GC) — the broadest component. Master tooth numbering, four-handed technique, the restorative instrument sequence, and dental materials.
- 2
Step 2
Study Infection Control (ICE) — standard precautions, PPE don/doff order, the Spaulding classification, the instrument-processing workflow, and sterilization monitoring.
- 3
Step 3
Study Radiation Health & Safety (RHS) — paralleling vs bisecting, the angulation errors (elongation vs foreshortening), ALARA, and patient/operator protection.
- 4
Step 4
Note the overlap: standard precautions appear in both ICE and RHS, so studying infection control once helps two components.
- 5
Step 5
Take full-length practice tests for each component, review every wrong answer, and aim for confident, consistent accuracy before exam day.
- Treat it as three exams. Plan study time per component; GC is the broadest, so give it the most.
- Master the most-confused pairs. Elongation vs foreshortening (RHS) and critical vs semicritical vs noncritical (ICE) recur constantly.
- Lock in the sequences. PPE don/doff order, the instrument-processing workflow, and the amalgam instrument sequence are high-yield, repeatable points.
- Use the overlap. Infection control is tested in both ICE and RHS — study it once, score it twice.
- Then prove it. When a component feels easy, confirm it with our practice questions and flashcards.
Common questions DANB CDA candidates search and get asked — each answered briefly and backed by an official source (DANB, CDC, OSHA, ADA/FDA, or NIH). Tap any card to test yourself.
DANB CDA Concept Questions
DANB CDA Glossary
Key DANB CDA terms in one place. Hover any dotted term throughout the guide for its definition; the full list is below.
- DANB
- Dental Assisting National Board — the national certifying body that develops and awards the Certified Dental Assistant (CDA) credential.
- CDA
- Certified Dental Assistant — the DANB credential earned by passing three separate component exams (GC, RHS, and ICE) within a five-year period.
- GC
- General Chairside Assisting — the CDA component exam (95 items) covering evaluation, chairside dentistry, dental materials, and patient management/administration.
- RHS
- Radiation Health and Safety — the CDA component exam (75 items) covering dental radiographic technique, radiation characteristics and protection, and infection control in imaging.
- ICE
- Infection Control — the CDA component exam (75 items) covering disease-transmission prevention, cross-contamination control, instrument processing, and occupational safety.
- scaled score
- A score reported on DANB's 100–900 range that adjusts for exam difficulty; 400 is the passing standard on each component.
- CODA
- Commission on Dental Accreditation — accredits the dental assisting and dental hygiene programs that satisfy DANB's education eligibility pathway.
- tooth numbering
- A system for naming each tooth; the U.S. standard is the Universal system, numbering permanent teeth 1–32.
- Universal numbering system
- The U.S. tooth-numbering standard: permanent teeth are 1–32 starting at the maxillary right third molar; primary teeth are lettered A–T.
- mesial
- The tooth surface toward the midline of the dental arch (toward the front centerline).
- distal
- The tooth surface away from the midline of the dental arch (toward the back).
- occlusal
- The chewing surface of a posterior tooth (premolar or molar).
- four-handed dentistry
- Coordinated, seated team dentistry in which the assistant passes instruments in the transfer zone so the operator never looks away from the field.
- amalgam
- A durable, silver-colored restorative alloy of silver, tin, copper, and mercury used for posterior fillings.
- composite resin
- A tooth-colored restorative material that is acid-etched, bonded, and light-cured; chosen where esthetics matter.
- acid etch
- Application of about 37% phosphoric acid to roughen and clean enamel so a bonding agent and composite can mechanically lock on.
- matrix
- A temporary band (e.g., a Tofflemire band) that forms a missing wall so a Class II restoration can be packed and contoured.
- malocclusion
- An abnormal bite; Angle's classification (Class I, II, III) describes it by the molar relationship.
- vital signs
- Measurements of body function — pulse, respiration, blood pressure, and temperature — recorded as a baseline before treatment.
- standard precautions
- Treating every patient's blood, body fluids, and non-intact skin/mucosa as potentially infectious, for every patient.
- hand hygiene
- Handwashing or alcohol-based hand rub before and after every patient contact — the single most effective infection-control measure.
- PPE
- Personal protective equipment — gloves, masks, protective eyewear, and gowns — that creates a barrier against exposure.
- sterilization
- A process that destroys all microorganisms, including resistant bacterial spores; required for critical and semicritical instruments.
- disinfection
- Destroying many or most pathogens (but not necessarily spores); used on environmental surfaces, not critical instruments.
- Spaulding classification
- Sorting items by infection risk — critical (sterilize), semicritical (sterilize/high-level disinfect), or noncritical (surface disinfect).
- autoclave
- A sterilizer that uses steam under pressure — the most common sterilization method in dentistry.
- biological monitor
- A spore test run through a sterilizer at least weekly — the only true proof the sterilizer kills bacterial spores.
- chemical indicator
- Tape or markings that change color to confirm a package was exposed to the sterilization process (not proof of sterility).
- bloodborne pathogens
- Disease-causing microbes in blood — chiefly HBV, HCV, and HIV — addressed by the OSHA Bloodborne Pathogens Standard.
- sharps
- Needles, blades, and other items that can puncture skin; disposed of in a puncture-resistant container without recapping by hand.
- Exposure Control Plan
- A written OSHA-required plan, reviewed annually, describing how an office protects workers from bloodborne-pathogen exposure.
- ALARA
- As Low As Reasonably Achievable — keeping radiation exposure to patients and staff as low as possible.
- paralleling technique
- Placing the receptor parallel to the tooth's long axis with the central ray perpendicular to both — the preferred, most accurate radiographic technique.
- bisecting angle technique
- Aiming the central ray perpendicular to a line bisecting the angle between the tooth's long axis and the receptor.
- elongation
- A radiographic image that looks too long, caused by too little (too flat) vertical angulation.
- foreshortening
- A radiographic image that looks too short, caused by too much (too steep) vertical angulation.
- overlapping
- Superimposed proximal tooth contacts on a radiograph, caused by incorrect horizontal angulation.
- cone cut
- A clear, curved unexposed area on a radiograph caused by the position-indicating device not being centered over the receptor.
- collimation
- Restricting the size and shape of the x-ray beam (e.g., a rectangular collimator) to reduce patient exposure.
- bitewing
- A radiograph that best shows interproximal caries and the height of the crestal (alveolar) bone.
- lead apron
- A shield placed over the patient's trunk to protect against scatter radiation during dental imaging.
- thyroid collar
- A shield protecting the radiosensitive thyroid gland; not used for panoramic imaging because it would block the beam.
- dosimeter
- A badge worn on the trunk to monitor an operator's occupational radiation exposure over time.
DANB CDA Study Guide FAQ
Three. The Certified Dental Assistant (CDA) credential is earned by passing three separate component exams — General Chairside Assisting (GC), Radiation Health and Safety (RHS), and Infection Control (ICE) — all within a five-year period. They can be taken together in one appointment or separately, and each component is scored independently.
Each is multiple-choice and computer-adaptive: General Chairside Assisting (GC) has 95 scored items with a 75-minute limit; Radiation Health and Safety (RHS) has 75 items in 60 minutes; and Infection Control (ICE) has 75 items in 60 minutes. DANB does not publish the number of unscored pretest items, so a total-with-pretest number is not stated.
Each component is scored on a scaled range of 100 to 900, and the passing standard on every component is a scaled score of 400. Because the exams are computer-adaptive and criterion-referenced, your result is reported as a scaled score rather than a raw percentage, and you must pass all three components to earn the CDA.
Four areas: Chairside Dentistry (50% — four-handed technique, restorations, oral surgery, preventive, and intraoral procedures), Evaluation (17% — vital signs, anatomy, tooth numbering, charting, and medical emergencies), Patient Management & Administration (17% — records, OSHA/CDC/HIPAA, inventory), and Dental Materials (16% — impression, operative, and laboratory materials).
Three areas: Purpose and Technique (50% — image types including CBCT, paralleling and bisecting technique, error correction, mounting, and tooth numbering), Radiation Characteristics and Protection (25% — radiation physics and biology, units, ALARA, filtration, shielding, and collimation), and Infection Prevention and Control during imaging (25%). RHS tests digital radiography only.
Four areas: Prevention of Cross-contamination (34% — surface disinfection, barriers, waterlines, and biohazard waste), Process Instruments and Devices (26% — the sterilization workflow and monitoring), Prevention of Disease Transmission (20% — hand hygiene, PPE, and modes of transmission), and Occupational Safety and Administration (20% — OSHA Bloodborne Pathogens and Hazard Communication).
DANB offers three pathways: graduating from a CODA-accredited dental assisting or dental hygiene program; high-school graduation plus about 3,500 hours of work experience as a dental assistant; or prior DANB certification or a U.S./foreign dental-school education. All pathways require current hands-on CPR. Verify the exact current requirements on the DANB CDA Application Packet, as details change.
The CDA is renewed annually. For a single certification, DANB requires 12 continuing dental education (CDE) credits per year plus a renewal fee (a dated anchor — about $75), and current CPR must be maintained. Holders of multiple DANB certifications need more CDE credits and pay a higher fee. A late fee applies if renewal lapses.
As a dated anchor, taking all three components together is about $450, and any single component is about $270, each including a nonrefundable application fee. Bundling all three costs less than taking them one at a time. Fees change by window, so verify the current amounts on the DANB application before you register.
Study by component and by weight. Start with General Chairside (the broadest and most clinical), then Infection Control, then Radiation Health and Safety. Within each, prioritize the heaviest content area — GC's Chairside Dentistry (50%), ICE's Cross-contamination (34%), and RHS's Purpose and Technique (50%). After each module, drill our free DANB CDA practice questions and flashcards.
Yes — the full guide, the glossary, the concept questions, the practice questions, and the flashcards are 100% free with no account required.
References
- 1.Dental Assisting National Board (DANB). “CDA Exam & Component Exam Outlines (GC, RHS, ICE) and CDA Application Packet.” DANB. ↑
- 2.Dental Assisting National Board (DANB). “Maintain Your Certification — CDA Recertification Requirements.” DANB. ↑
- 3.Centers for Disease Control and Prevention (CDC). “Summary of Infection Prevention Practices in Dental Settings: Basic Expectations for Safe Care.” CDC. ↑
- 4.Occupational Safety and Health Administration (OSHA). “Bloodborne Pathogens Standard (29 CFR 1910.1030).” OSHA. ↑
- 5.American Dental Association (ADA) / U.S. Food and Drug Administration (FDA). “Dental Radiographic Examinations: Recommendations for Patient Selection and Limiting Radiation Exposure.” ADA / FDA. ↑
- 6.National Institutes of Health / National Library of Medicine. “StatPearls (dental anatomy, tooth numbering, restorative materials, vital signs).” NIH/NLM. ↑
- 101.U.S. Food and Drug Administration (FDA) / American Dental Association (ADA). “Occupational Radiation Protection in Dentistry (ADA/FDA).” ada.org / fda.gov, accessed 19 June 2026. ↑
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