200+ Free RDA Practice Questions

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When reviewing a patient's medical history, which condition requires the dental assistant to alert the dentist before beginning treatment?

Patient had a dental cleaning 6 months ago

Patient is taking blood thinning medication

Patient prefers morning appointments

Patient has dental insurance

to track

2026 Statistics

Key Facts: RDA Exam

140

Exam Questions

Multiple-choice

75%

Passing Score

Dental Board of CA

2 hrs

Exam Duration

PSI

$100-125

Exam Fee

Dental Board of CA

50%

Dental Procedures

Largest domain

2 years

License Renewal

CE required

The RDA exam has 140 multiple-choice questions in 2 hours with a 75% passing score. Four domains: Dental Procedures (50%), Infection Control & Safety (25%), Assessment & Diagnostic Records (15%), and Laws & Regulations (10%). Requires completion of Board-approved RDA program and CPR certification. Total cost: $180-$245 including application.

Sample RDA Practice Questions

Try these sample questions to test your RDA exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1When reviewing a patient's medical history, which condition requires the dental assistant to alert the dentist before beginning treatment?

A.Patient had a dental cleaning 6 months ago

B.Patient is taking blood thinning medication

C.Patient prefers morning appointments

D.Patient has dental insurance

Explanation: Blood thinning medications can increase bleeding risk during dental procedures. The dentist must be informed to evaluate bleeding risk and potentially adjust the treatment plan or medication schedule with the patient's physician.

2Which of the following is NOT typically included in a comprehensive dental patient history form?

A.Current medications

B.Previous surgeries

C.Employment salary history

D.Allergies to medications

Explanation: Patient employment salary information is not medically relevant and should not be included in a dental health history form. Medical conditions, medications, allergies, and previous surgeries are all essential components.

3What is the normal range for adult blood pressure?

A.90/60 to 120/80 mmHg

B.120/80 to 140/90 mmHg

C.100/70 to 130/85 mmHg

D.110/70 to 140/90 mmHg

Explanation: Normal adult blood pressure is typically considered to be between 90/60 mmHg and 120/80 mmHg. Readings above 120/80 may indicate prehypertension or hypertension, requiring dental modifications or physician referral.

4Where is the radial pulse most commonly assessed on a patient?

A.At the base of the neck

B.On the inner aspect of the wrist

C.At the temple near the ear

D.Behind the knee

Explanation: The radial pulse is located on the thumb side of the wrist, over the radial artery. This is the most common site for routine pulse assessment because it is easily accessible and requires minimal patient positioning.

5In the Universal Numbering System, which tooth is designated as tooth #8?

A.Maxillary right central incisor

B.Maxillary left central incisor

C.Mandibular right central incisor

D.Maxillary right lateral incisor

Explanation: In the Universal Numbering System, tooth #8 is the maxillary right central incisor. The system numbers teeth 1-16 for the upper arch (right to left) and 17-32 for the lower arch (left to right).

6Which charting symbol represents a missing tooth?

A.Circle around the tooth

B.X through the tooth

C.Triangle pointing down

D.Horizontal line across the tooth

Explanation: An X drawn through a tooth on a dental chart indicates that the tooth is missing. This is the standard notation used across most charting systems to denote edentulous spaces.

7During an oral examination, what color should healthy gingival tissue appear?

A.Bright red

B.Coral pink

C.Dark purple

D.Pale white

Explanation: Healthy gingival tissue typically appears coral pink in color. Redness may indicate inflammation, while pale tissue could suggest anemia or other systemic conditions.

8What instrument is commonly used to measure periodontal pocket depths?

A.Dental explorer

B.Periodontal probe

C.Curette

D.Mirror handle

Explanation: A periodontal probe is specifically designed with calibrated markings to measure pocket depths around teeth. Normal sulcus depth is 1-3 mm; depths greater than 3 mm indicate periodontal disease.

9What type of radiograph shows the entire tooth including the crown, root, and surrounding bone?

A.Bitewing

B.Periapical

C.Panoramic

D.Occlusal

Explanation: Periapical radiographs capture the entire tooth from crown to root tip, plus the surrounding periapical bone. They are essential for diagnosing abscesses, root fractures, and periapical pathology.

10Which radiographic view is primarily used to detect interproximal decay between posterior teeth?

A.Periapical

B.Bitewing

C.Panoramic

D.Cephalometric

Explanation: Bitewing radiographs are specifically designed to visualize the crowns of upper and lower posterior teeth simultaneously, making them ideal for detecting interproximal caries and monitoring bone levels.

About the RDA Exam

The RDA (Registered Dental Assistant) exam validates competency in dental procedures, infection control and safety, assessment and diagnostic records, and dental laws and regulations. It is required for California RDA licensure and covers clinical and regulatory knowledge.

Questions

140 scored questions

Time Limit

2 hours

Passing Score

75%

Exam Fee

$100-$125 (Dental Board of California / PSI Services)

RDA Exam Content Outline

50%

Dental Procedures

Provisional restorations, preventive procedures, isolation techniques, materials/supplies, patient education

25%

Infection Control & Health/Safety

Hand hygiene, PPE, sterilization, disinfection, bloodborne pathogens, hazard communication

15%

Assessment & Diagnostic Records

Patient history, vital signs, oral assessment, charting, diagnostic records

10%

Laws & Regulations

Licensing requirements, scope of practice, professional conduct, ethics, HIPAA

How to Pass the RDA Exam

What You Need to Know

Passing score: 75%
Exam length: 140 questions
Time limit: 2 hours
Exam fee: $100-$125

Keys to Passing

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

RDA Study Tips from Top Performers

1Focus on Dental Procedures (50%) — by far the largest domain covering restorations, preventive procedures, and isolation

2Master infection control protocols (25%): hand hygiene steps, PPE donning/doffing order, sterilization monitoring

3Know bloodborne pathogen standards and post-exposure protocols

4Study dental charting systems: Universal Numbering System, Palmer notation, and FDI notation

5Review California dental practice act: scope of practice, supervision levels, and permitted duties

6Understand HIPAA compliance requirements for dental office settings

Frequently Asked Questions

What is the RDA certification?

RDA (Registered Dental Assistant) is a California credential required to perform expanded duties as a dental assistant. It validates competency in dental procedures, infection control, patient assessment, and dental law compliance.

How many questions are on the RDA exam?

The RDA exam has 140 multiple-choice questions in 2 hours. The passing score is 75%. The exam is administered by PSI Services at test centers throughout California.

What are the prerequisites for the RDA exam?

You must be 18 or older, have a high school diploma, complete a Board-approved RDA program or equivalent training pathway, and hold current CPR (BLS for Healthcare Providers) certification.

What is the scope of practice for an RDA?

RDAs can perform expanded duties including placing provisional restorations, applying topical anesthetic, taking impressions, exposing radiographs, and performing coronal polishing under dentist supervision. Scope is defined by the Dental Board of California.

How should I prepare for the RDA exam?

Plan for 60-100 hours of study over 4-8 weeks. Focus on Dental Procedures (50%) — the largest domain by far. Also prioritize Infection Control (25%). Master sterilization protocols, hand hygiene, and PPE requirements.