CDA Practice Test

CDA Exam at a Glance

What Is CDA Certification?

The CDA credential demonstrates that a dental assistant has met DANB’s eligibility and examination requirements. The certification covers important aspects of dental assisting practice, including patient care, chairside support, infection prevention, and dental radiography.

Dental assistants may perform a variety of duties depending on their training, experience, and state regulations. Common responsibilities include preparing treatment areas, assisting dentists during procedures, maintaining infection control standards, processing dental instruments, and helping patients understand treatment instructions.

Although DANB certification is recognized across the country, it does not automatically authorize you to perform every dental assisting duty in every state. State dental boards determine which credentials, registrations, permits, or additional training are required for specific duties.

Who Is Eligible for the CDA Exam?

To qualify for CDA certification, you must meet the requirements of one of DANB’s eligibility pathways. All three pathways require current, hands-on CPR, Basic Life Support (BLS), or Advanced Cardiovascular Life Support (ACLS) certification from a DANB-accepted provider.

Pathway I: Accredited Education

This pathway is intended for candidates who have graduated from a dental assisting or dental hygiene program accredited by the Commission on Dental Accreditation (CODA).

Eligible candidates must also hold current, accepted CPR, BLS, or ACLS certification. Certain students nearing graduation may qualify under DANB’s special application provisions.

Pathway II: Work Experience

Candidates who have not completed a CODA-accredited program may qualify through professional experience. This pathway requires:

• A high school diploma or equivalent.
• At least 3,500 hours of approved dental assisting work experience.
• Current hands-on CPR, BLS, or ACLS certification from a DANB-accepted provider.

Pathway III: Previous Certification or Dental Education

This pathway includes candidates who previously held DANB CDA certification, individuals with qualifying dental education from the United States or abroad, and certain students or graduates of accepted dental school or post-baccalaureate programs.

Current hands-on CPR, BLS, or ACLS certification from an accepted provider is also required.

CDA Exam Format

The CDA certification consists of three computer-based component exams. Candidates can take them together as the combined CDA exam or register for the components separately. All three must be passed within a five-year period to earn certification.

DANB administers most examinations using computer adaptive testing. The difficulty of subsequent questions adjusts based on your responses, allowing the examination to measure your knowledge and skills.

Because adaptive testing generally does not allow you to skip questions and return to them later, you should make your best selection before advancing.

What Is on the CDA Exam?

Each component exam focuses on a different area of dental assisting. Together, they assess essential knowledge related to dental radiography, infection prevention, patient care, and chairside procedures.

Radiation Health and Safety (RHS)

The RHS exam evaluates your understanding of dental radiography procedures and techniques used to protect patients and dental personnel from unnecessary radiation exposure.

Important topics include:

• Radiographic Procedures: Selecting appropriate imaging techniques, positioning receptors, understanding exposure factors, and obtaining diagnostic images.
• Image Evaluation: Identifying common imaging errors, interpreting image quality, and determining when corrective action is necessary.
• Radiation Protection: Applying radiation safety principles, limiting unnecessary exposure, and maintaining safe practices for patients and operators.
• Infection Prevention: Following appropriate infection control procedures when handling radiographic equipment, sensors, receptors, and contaminated materials.
• Quality Assurance: Maintaining imaging equipment, following regulatory requirements, and supporting consistent image quality.

For the exact content distribution and examination objectives, review DANB’s current RHS exam outline.

Infection Control (ICE)

The ICE exam evaluates the knowledge necessary to reduce the risk of disease transmission in dental settings. It includes the safe handling of instruments, environmental infection prevention, occupational safety, and appropriate use of protective measures.

Important topics include:

• Standard Precautions: Understanding how infectious agents spread and applying precautions to protect patients and healthcare personnel.
• Personal Protective Equipment: Selecting, using, and removing gloves, masks, protective clothing, and eye protection appropriately.
• Instrument Processing: Cleaning, packaging, sterilizing, monitoring, and storing reusable instruments and equipment.
• Environmental Infection Prevention: Cleaning and disinfecting clinical contact surfaces, managing contaminated materials, and preventing cross-contamination.
• Occupational Safety: Applying exposure control plans, following safe sharps practices, and understanding relevant workplace safety requirements.

Prepare for questions that require you to choose appropriate infection prevention procedures in realistic dental office situations.

General Chairside Assisting (GC)

The GC exam assesses practical knowledge of chairside dental assisting, patient management, dental materials, and procedures performed in a dental practice.

Important topics include:

• Patient Preparation: Reviewing medical histories, preparing patients for treatment, and supporting patient safety and comfort.
• Chairside Procedures: Preparing instruments and equipment, maintaining the treatment field, transferring instruments, and assisting during common dental procedures.
• Dental Materials: Understanding the characteristics, manipulation, and proper handling of materials used in restorative and other dental procedures.
• Diagnostic and Laboratory Procedures: Assisting with impressions, models, records, and other procedures within the dental assistant’s authorized duties.
• Patient Management: Communicating effectively, documenting treatment information, providing instructions, and supporting efficient clinical operations.

The GC component contains the largest number of questions, so candidates preparing for the full CDA exam should allow sufficient study time for chairside assisting topics.

The official DANB examination preparation page provides the current RHS, ICE, and GC content outlines, including the precise domains and their weights.

How to Register for the CDA Exam

To register, submit an application through DANB and provide any documentation required for your eligibility pathway. After your application has been accepted, you can schedule your examination through Pearson VUE.

The combined CDA examination currently costs $450. Applicants who choose to take the component exams individually or in smaller combinations should review the corresponding registration fees before applying.

The general registration process includes:

1. Confirm your eligibility. Determine which CDA pathway applies to your education or work experience.
2. Complete the application. Submit the required information, documentation, and examination fee through DANB.
3. Receive authorization. Once approved, you will receive instructions for scheduling your examination.
4. Schedule your appointment. Choose an available Pearson VUE testing center and appointment within your authorized testing window.
5. Prepare for test day. Review your confirmation, identification requirements, and applicable testing policies.

The standard examination eligibility window is 60 days. Make sure you schedule and complete your exam within the period specified in your authorization.

How Is the CDA Exam Scored?

DANB reports examination results using scaled scores rather than the percentage of questions answered correctly. Scores range from 100 to 900, and a scaled score of 400 or higher is required to pass each component examination.

Because most DANB exams use computer adaptive testing, the difficulty of the questions you answer is considered when determining your score. There is no fixed percentage of correct answers that guarantees a passing result.

To earn CDA certification, you must pass all three required components within five years. This means you can retain credit for a passed component while completing the remaining examinations, provided you meet DANB’s certification requirements and deadlines.

If you do not pass a component, review your results and the current DANB retesting policies before reapplying. Additional examination fees will apply.

What to Expect on Test Day

The combined CDA examination is administered at Pearson VUE testing centers. Individual component exams may have additional testing options, depending on the examination.

Before your appointment, review your confirmation and the current testing rules. Important considerations include:

• Identification: Bring the identification required by DANB and Pearson VUE. Your registration information must match your identification.
• Arrival: Follow the arrival and check-in instructions in your appointment confirmation.
• Personal Belongings: Phones, notes, study materials, and other unauthorized items are not allowed in the testing room.
• Time Management: Each component has a separate time limit, so practice answering questions at an appropriate pace.
• Adaptive Testing: You generally cannot return to a previous question after submitting your answer.
• Accommodations: Candidates who need testing accommodations should follow DANB’s accommodation request procedures before scheduling.

How to Prepare for the CDA Exam

Preparing for the CDA exam requires understanding dental assisting principles and applying them to common clinical situations. A structured approach can help you identify weak areas and make the best use of your study time.

1. Review the three component outlines. Familiarize yourself with RHS, ICE, and GC exam objectives so you know which subjects require review.
2. Take a CDA practice test. Use your initial results to identify weaknesses in radiography, infection control, or chairside assisting.
3. Strengthen your clinical knowledge. Review dental terminology, treatment procedures, instrument identification, dental materials, and patient care principles.
4. Review safety procedures. Pay particular attention to radiation protection, sterilization, standard precautions, and occupational safety.
5. Practice clinical scenarios. Work through questions that require selecting appropriate procedures or identifying the best response to a patient care situation.
6. Review missed questions. Understand why the correct answer is appropriate and why the other options are less suitable.
7. Complete timed practice sessions. Build familiarity with the time available for each component and practice making decisions without revisiting previous answers.

CDA Practice Tests and Study Resources

The following resources can help you review dental assisting concepts, practice exam-style questions, and prepare for the three CDA component examinations.

Frequently Asked Questions

How many questions are on the CDA exam?

The combined CDA exam contains 245 questions. The RHS and ICE components each contain 75 questions, and the GC component contains 95 questions.

How long is the CDA exam?

The combined testing time is 195 minutes, or three hours and 15 minutes. The RHS and ICE components each have a 60-minute time limit, while the GC component has a 75-minute limit.

What score do you need to pass the CDA exam?

You must earn a scaled score of at least 400 on each component examination. DANB reports scores on a scale ranging from 100 to 900.

How much does the CDA exam cost?

The current combined CDA examination fee is $450. Fees differ if you register for individual components or other examination combinations.

Can you take the CDA components separately?

Yes. You can take RHS, ICE, and GC separately or together. You must pass all three components within five years to earn CDA certification.

Is the CDA exam computer adaptive?

Most DANB exams use computer adaptive testing, which adjusts question difficulty based on your responses. You generally cannot skip questions or return to previous answers.

Can you take the CDA exam online?

The combined CDA examination is offered at Pearson VUE testing centers. Some individual component examinations also have online-proctored options, depending on DANB’s current testing arrangements.

Can you retake the CDA exam if you fail?

Yes. Candidates who do not pass can apply to retake the relevant examination or component. Additional fees apply, and candidates should review DANB’s current retesting requirements before submitting another application.

Does CDA certification allow you to work in every state?

CDA certification is nationally recognized, but each state establishes its own dental assisting regulations. Some states require additional registration, training, or authorization for particular duties. Check with your state dental board before beginning work.