NDHCE Mock Exam Questions 2024/2025
– 100% Verified Questions with Complete
Correct Answers
National Dental Hygiene Certification Exam Preparation
80 Unique Multiple-Choice Questions with Verified Answers and
Complete Explanations
Instructions
This mock exam consists of 80 multiple-choice questions designed to prepare candidates
for the National Dental Hygiene Certification Exam (NDHCE) for 2024/2025. Each
question includes four answer options, with the correct answer marked. Complete ex-
planations provide the rationale for the correct answer and clarify why other options
are incorrect. The questions align with the NDHCE Blueprint, covering clinical dental
hygiene, community oral health, and professional practice. Read each question carefully
and select the best answer.
1
,Mock Exam Questions
Question 1: A patient presents with a white, non-scrapable patch on the buccal mucosa.
What is the most likely diagnosis?
a. Oral candidiasis.
b. Leukoplakia. (Correct)
c. Lichen planus.
d. Aphthous ulcer.
Rationale: Leukoplakia is a white, non-scrapable patch often linked to
chronic irritation or potential malignancy. Oral candidiasis is scrapable,
lichen planus has a lacy pattern, and aphthous ulcers are painful and not
typically white.
Question 2: What is the primary goal of scaling and root planing?
a. To whiten teeth.
b. To remove plaque and calculus from tooth surfaces. (Correct)
c. To restore decayed teeth.
d. To apply fluoride.
Rationale: Scaling and root planing remove plaque, calculus, and toxins
to treat periodontal disease. Whitening, restoration, and fluoride applica-
tion are not primary objectives.
Question 3: A patient with type 2 diabetes is at increased risk for which oral condition?
a. Periodontal disease. (Correct)
b. Enamel hypoplasia.
c. Oral squamous cell carcinoma.
d. Dentinogenesis imperfecta.
Rationale: Diabetes increases periodontal disease risk due to impaired im-
mune response and healing. Enamel hypoplasia, carcinoma, and dentino-
genesis imperfecta are not directly related.
Question 4: What is the recommended dental prophylaxis interval for a patient with
healthy gingiva?
a. Every 3 months.
b. Every 6 months. (Correct)
c. Every 12 months.
d. Every 24 months.
2
, Rationale: Patients with healthy gingiva require prophylaxis every 6
months. More frequent visits are for periodontal disease, and less frequent
visits may be inadequate.
Question 5: Which tooth numbering system is used in the NDHCE?
a. Universal numbering system.
b. Palmer notation.
c. FDI two-digit system. (Correct)
d. ISO system.
Rationale: The NDHCE uses the FDI two-digit system, as specified by
the Federation of Dental Hygiene Regulators of Canada. Other systems
are not used.
Question 6: A patient reports sensitivity to cold in tooth 1.1. What is the most likely
cause?
a. Dental caries. (Correct)
b. Periodontal abscess.
c. Bruxism.
d. TMJ disorder.
Rationale: Sensitivity to cold in tooth 1.1 (maxillary right central incisor)
is commonly due to caries exposing dentin. Abscesses cause gum pain,
bruxism causes wear, and TMJ disorders cause jaw pain.
Question 7: What is the primary fluoride source in community water fluoridation?
a. Sodium fluoride. (Correct)
b. Calcium fluoride.
c. Potassium fluoride.
d. Magnesium fluoride.
Rationale: Sodium fluoride is used in water fluoridation to prevent caries.
Other compounds are not typically used.
Question 8: Which clinical sign is most associated with gingivitis?
a. Bleeding on probing. (Correct)
b. Bone loss on radiographs.
c. Tooth mobility.
d. Furcation involvement.
Rationale: Gingivitis causes inflammation and bleeding on probing with-
out bone loss. Bone loss, mobility, and furcation are signs of periodontitis.
Question 9: What is the most effective method to prevent dental caries in children?
3
– 100% Verified Questions with Complete
Correct Answers
National Dental Hygiene Certification Exam Preparation
80 Unique Multiple-Choice Questions with Verified Answers and
Complete Explanations
Instructions
This mock exam consists of 80 multiple-choice questions designed to prepare candidates
for the National Dental Hygiene Certification Exam (NDHCE) for 2024/2025. Each
question includes four answer options, with the correct answer marked. Complete ex-
planations provide the rationale for the correct answer and clarify why other options
are incorrect. The questions align with the NDHCE Blueprint, covering clinical dental
hygiene, community oral health, and professional practice. Read each question carefully
and select the best answer.
1
,Mock Exam Questions
Question 1: A patient presents with a white, non-scrapable patch on the buccal mucosa.
What is the most likely diagnosis?
a. Oral candidiasis.
b. Leukoplakia. (Correct)
c. Lichen planus.
d. Aphthous ulcer.
Rationale: Leukoplakia is a white, non-scrapable patch often linked to
chronic irritation or potential malignancy. Oral candidiasis is scrapable,
lichen planus has a lacy pattern, and aphthous ulcers are painful and not
typically white.
Question 2: What is the primary goal of scaling and root planing?
a. To whiten teeth.
b. To remove plaque and calculus from tooth surfaces. (Correct)
c. To restore decayed teeth.
d. To apply fluoride.
Rationale: Scaling and root planing remove plaque, calculus, and toxins
to treat periodontal disease. Whitening, restoration, and fluoride applica-
tion are not primary objectives.
Question 3: A patient with type 2 diabetes is at increased risk for which oral condition?
a. Periodontal disease. (Correct)
b. Enamel hypoplasia.
c. Oral squamous cell carcinoma.
d. Dentinogenesis imperfecta.
Rationale: Diabetes increases periodontal disease risk due to impaired im-
mune response and healing. Enamel hypoplasia, carcinoma, and dentino-
genesis imperfecta are not directly related.
Question 4: What is the recommended dental prophylaxis interval for a patient with
healthy gingiva?
a. Every 3 months.
b. Every 6 months. (Correct)
c. Every 12 months.
d. Every 24 months.
2
, Rationale: Patients with healthy gingiva require prophylaxis every 6
months. More frequent visits are for periodontal disease, and less frequent
visits may be inadequate.
Question 5: Which tooth numbering system is used in the NDHCE?
a. Universal numbering system.
b. Palmer notation.
c. FDI two-digit system. (Correct)
d. ISO system.
Rationale: The NDHCE uses the FDI two-digit system, as specified by
the Federation of Dental Hygiene Regulators of Canada. Other systems
are not used.
Question 6: A patient reports sensitivity to cold in tooth 1.1. What is the most likely
cause?
a. Dental caries. (Correct)
b. Periodontal abscess.
c. Bruxism.
d. TMJ disorder.
Rationale: Sensitivity to cold in tooth 1.1 (maxillary right central incisor)
is commonly due to caries exposing dentin. Abscesses cause gum pain,
bruxism causes wear, and TMJ disorders cause jaw pain.
Question 7: What is the primary fluoride source in community water fluoridation?
a. Sodium fluoride. (Correct)
b. Calcium fluoride.
c. Potassium fluoride.
d. Magnesium fluoride.
Rationale: Sodium fluoride is used in water fluoridation to prevent caries.
Other compounds are not typically used.
Question 8: Which clinical sign is most associated with gingivitis?
a. Bleeding on probing. (Correct)
b. Bone loss on radiographs.
c. Tooth mobility.
d. Furcation involvement.
Rationale: Gingivitis causes inflammation and bleeding on probing with-
out bone loss. Bone loss, mobility, and furcation are signs of periodontitis.
Question 9: What is the most effective method to prevent dental caries in children?
3
