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100+ Free QCHP/DHP Dentist Exam Practice Questions

Pass your QCHP/DHP Qualifying Examination - Dentist (CBT via Prometric) exam on the first try — instant access, no signup required.

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An edentulous patient reports a sore, red, velvety area under a maxillary complete denture that worsens with continuous wear. The most likely diagnosis is:

A
B
C
D
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Sample QCHP/DHP Dentist Exam Practice Questions

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

1Which nerve provides sensory innervation to the mandibular molars and must be anaesthetised by an inferior alveolar nerve block before their extraction?
A.Inferior alveolar nerve
B.Long buccal nerve
C.Lingual nerve
D.Mental nerve
Explanation: The inferior alveolar nerve, a branch of the mandibular division (V3) of the trigeminal nerve, supplies the mandibular molars and premolars via the dental plexus. An IAN block deposits anaesthetic near the mandibular foramen to anaesthetise these teeth.
2A patient on long-term warfarin requires a simple extraction. Which laboratory value is the most appropriate to check before the procedure to assess bleeding risk?
A.Platelet count
B.International normalised ratio (INR)
C.Activated partial thromboplastin time (aPTT)
D.Bleeding time
Explanation: Warfarin inhibits vitamin K-dependent clotting factors, and its effect is monitored with the INR. Most guidelines allow simple extractions when the INR is within the therapeutic range (typically below 4.0) without interrupting warfarin.
3Which microorganism is most strongly associated with the initiation of dental caries because of its acidogenic and aciduric properties and ability to adhere to enamel?
A.Porphyromonas gingivalis
B.Aggregatibacter actinomycetemcomitans
C.Streptococcus mutans
D.Candida albicans
Explanation: Streptococcus mutans produces acid from dietary sugars (acidogenic), survives at low pH (aciduric), and synthesises adhesive extracellular glucans, making it the principal initiator of enamel caries.
4A healthy 70 kg adult is to receive 2% lidocaine with 1:100,000 epinephrine. Using the manufacturer maximum of 7 mg/kg (absolute cap 500 mg), what is the maximum total lidocaine dose?
A.350 mg
B.140 mg
C.700 mg
D.490 mg
Explanation: 7 mg/kg x 70 kg = 490 mg, which is below the 500 mg absolute cap, so 490 mg is the maximum. Each 1.8 mL cartridge of 2% lidocaine contains 36 mg, so roughly 13 cartridges would be the theoretical limit.
5Enamel is the hardest tissue in the body. By weight, approximately what percentage of mature enamel is inorganic hydroxyapatite?
A.About 96%
B.About 50%
C.About 70%
D.About 30%
Explanation: Mature enamel is roughly 96% inorganic (mainly carbonated hydroxyapatite) by weight, with the remainder being water and organic matrix. This high mineral content makes it the hardest but also brittle tissue.
6Which mechanism best explains how topical fluoride helps prevent dental caries?
A.It kills all oral bacteria on contact
B.It forms fluorapatite which is more acid-resistant and promotes remineralisation
C.It mechanically seals enamel pits and fissures
D.It raises salivary pH to strongly alkaline levels
Explanation: Fluoride is incorporated into the apatite lattice forming fluorapatite, which has a lower critical pH and greater acid resistance, and it enhances remineralisation of early enamel lesions while inhibiting bacterial enzymes at higher concentrations.
7A patient reports a penicillin allergy and needs antibiotic prophylaxis for an indicated procedure. Which oral antibiotic is an appropriate alternative for a non-anaphylactic patient who can tolerate cephalosporins?
A.Amoxicillin
B.Metronidazole alone
C.Cephalexin
D.Tetracycline
Explanation: For penicillin-allergic patients without a history of anaphylaxis, cephalexin (a first-generation cephalosporin) is an accepted alternative for prophylaxis. Clindamycin was historically used but is now avoided due to C. difficile risk; macrolides are other options.
8Bisphosphonates, used for osteoporosis and malignancy, are relevant in dentistry primarily because they increase the risk of which complication after extractions?
A.Dry socket only
B.Rapid root resorption of adjacent teeth
C.Excessive intra-operative bleeding
D.Medication-related osteonecrosis of the jaw (MRONJ)
Explanation: Bisphosphonates inhibit osteoclast-mediated bone turnover, impairing healing and predisposing to medication-related osteonecrosis of the jaw, particularly after extractions in patients on high-potency intravenous regimens.
9Which salivary component is most responsible for buffering acids and helping to maintain a neutral oral pH?
A.Bicarbonate
B.Amylase
C.Lysozyme
D.Mucin
Explanation: The bicarbonate buffer system is the principal salivary buffer, neutralising plaque acids and raising pH after sugar exposure, which is critical for protecting enamel from demineralisation.
10A patient taking a non-selective beta-blocker may be at increased risk of a hypertensive reaction if given a large dose of which dental local anaesthetic component?
A.Lidocaine
B.Epinephrine (adrenaline)
C.Articaine base
D.Prilocaine
Explanation: Non-selective beta-blockers block beta-2 mediated vasodilation, so injected epinephrine acts on unopposed alpha-1 receptors causing vasoconstriction and a potential acute rise in blood pressure with reflex bradycardia. Limiting epinephrine dose and aspirating are prudent.

About the QCHP/DHP Dentist Exam Exam

The QCHP/DHP National General Dental Qualifying Examination is a mandatory computer-based test (Prometric code SCHQ2) for internationally trained general dentists seeking to practise in Qatar. It comprises 150 MCQs over 3 hours with a 60% cut score, and applicants are allowed up to 5 attempts.

Assessment

150 single-best-answer MCQs across Scientific Knowledge (35), Clinical Skills (100) and Affective Skills (15); clinical case-based with images and radiographs.

Time Limit

3 hours (official DHP table)

Passing Score

60% (90 of 150 correct)

Exam Fee

USD 285 per attempt from 1 January 2026 (was USD 238 through 2025), paid to Prometric; DataFlow PSV and DHP evaluation fees are additional. (Qatar Department of Healthcare Professions (DHP), MOPH (formerly QCHP))

QCHP/DHP Dentist Exam Exam Content Outline

23%

Scientific Knowledge

Biomedical sciences (anatomy, physiology, pathology, pharmacology, microbiology, biochemistry) applied clinically, plus evidence-based practice, research methods and study interpretation.

67%

Clinical Skills

Patient assessment and diagnosis, comprehensive treatment planning, health and safety, management of emergencies, prevention and population health, control of pain and anxiety, periodontics, paediatric dentistry, orthodontics, restorative dentistry and endodontics, prosthodontics, and oral surgery and oral medicine.

10%

Affective Skills

Communication skills, professionalism, ethical and legal practice (including Qatar DHP/MOPH regulation and confidentiality), and teamwork and leadership.

How to Pass the QCHP/DHP Dentist Exam Exam

What You Need to Know

  • Passing score: 60% (90 of 150 correct)
  • Assessment: 150 single-best-answer MCQs across Scientific Knowledge (35), Clinical Skills (100) and Affective Skills (15); clinical case-based with images and radiographs.
  • Time limit: 3 hours (official DHP table)
  • Exam fee: USD 285 per attempt from 1 January 2026 (was USD 238 through 2025), paid to Prometric; DataFlow PSV and DHP evaluation fees are additional.

Keys to Passing

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

QCHP/DHP Dentist Exam Study Tips from Top Performers

1Weight your study toward Clinical Skills, which is roughly two-thirds of the exam, and practise case-based questions with radiographs across restorative, endodontics, perio, prosthodontics, oral surgery and paediatrics.
2Download the current DHP reference list (updated 17 June 2025) and use core texts such as Odell's Clinical Problem Solving in Dentistry, Master Dentistry and the Oxford Handbook of Clinical Dentistry.
3Do not neglect the Affective Skills and emergencies content: learn medical-emergency drug doses, infection control, consent, confidentiality and the DHP/MOPH regulatory framework for practising in Qatar.

Frequently Asked Questions

How many questions are on the QCHP/DHP dentist exam and what is the pass mark?

The exam has 150 single-best-answer MCQs delivered over 3 hours via Prometric (code SCHQ2). The cut score set by DHP is 60%, equivalent to 90 of 150 correct, with results shown immediately at the test centre.

How many attempts are allowed for the Qatar dentist qualifying exam?

DHP MOPH allows up to 5 attempts to pass the qualifying examination, regardless of the gap between attempts, which is more generous than several other GCC regulators. A passed exam is generally valid for 3 years.

How much does the QCHP/DHP dentist Prometric exam cost?

The Prometric exam fee rose from USD 238 (2024-2025) to USD 285 per attempt effective 1 January 2026. DataFlow primary source verification and DHP evaluation fees are charged separately.

What does the exam blueprint cover?

Per the 17 June 2025 DHP blueprint, the exam covers three areas: Scientific Knowledge (35 questions), Clinical Skills (100 questions across all dental disciplines), and Affective Skills (15 questions on communication, professionalism, ethics and teamwork).