Dental Hygiene National Board Examination Practice Test Newest 2025
– 2026 Questions From Past Papers Actual Exams Complete 100
Questions And Correct Detailed Answers (Verified Answers) |Already
Graded A+||Brand New!!
Most Tested Content Areas Covered
Oral Anatomy and Histology
Dental Materials
Periodontology
Microbiology and Pathology
Community Dental Health
Radiology Principles
Pharmacology
Patient Management and Ethics
Preventive Dentistry
1. Which structure anchors the tooth to the alveolar bone through connective
tissue fibers?
A. Cementum
B. Periodontal ligament
C. Enamel
D. Pulp
Answer: B. Periodontal ligament
Explanation: The periodontal ligament contains connective tissue fibers that
attach the cementum of the tooth to the alveolar bone, allowing slight movement
and acting as a shock absorber.
2. The hardest substance in the human body is:
A. Dentin
B. Enamel
C. Cementum
D. Bone
,Answer: B. Enamel
Explanation: Enamel is highly mineralized (about 96% inorganic material) and
provides protection to underlying dentin and pulp.
3. Dental plaque is best described as:
A. A calcified deposit on enamel
B. A biofilm composed of microorganisms
C. A food debris layer
D. A stain on the tooth surface
Answer: B. A biofilm composed of microorganisms
Explanation: Plaque is a structured microbial biofilm adhering to tooth surfaces
and is the primary etiologic factor in caries and periodontal disease.
4. Which radiographic error results in overlapping of interproximal contacts?
A. Incorrect vertical angulation
B. Incorrect horizontal angulation
C. Excessive exposure time
D. Improper film placement
Answer: B. Incorrect horizontal angulation
Explanation: Improper horizontal angulation causes the X-ray beam to not pass
directly through contact points, leading to overlap.
5. The primary etiologic factor in gingivitis is:
A. Trauma
B. Plaque accumulation
C. Nutritional deficiency
D. Genetic mutation
Answer: B. Plaque accumulation
Explanation: Bacterial plaque accumulation at the gingival margin initiates
inflammatory response leading to gingivitis.
6. Which vitamin deficiency most commonly results in bleeding gums?
A. Vitamin A
B. Vitamin C
, C. Vitamin D
D. Vitamin K
Answer: B. Vitamin C
Explanation: Vitamin C deficiency (scurvy) impairs collagen formation and leads to
fragile capillaries and bleeding gingiva.
7. Which dental material is most commonly used for posterior restorations
due to its strength and durability?
A. Composite resin
B. Glass ionomer
C. Dental amalgam
D. Zinc oxide eugenol
Answer: C. Dental amalgam
Explanation: Amalgam is highly durable and resistant to wear, making it suitable
for posterior restorations with high occlusal stress.
8. The microorganism most strongly associated with dental caries initiation is:
A. Streptococcus mutans
B. Lactobacillus acidophilus
C. Actinomyces israelii
D. Candida albicans
Answer: A. Streptococcus mutans
Explanation: Streptococcus mutans metabolizes sugars into acids that
demineralize enamel and initiate caries.
9. The pulp of the tooth primarily contains:
A. Bone and enamel
B. Blood vessels and nerves
C. Cementum and dentin
D. Salivary glands
Answer: B. Blood vessels and nerves
Explanation: Dental pulp is a soft connective tissue containing nerves, blood
vessels, and odontoblasts.
– 2026 Questions From Past Papers Actual Exams Complete 100
Questions And Correct Detailed Answers (Verified Answers) |Already
Graded A+||Brand New!!
Most Tested Content Areas Covered
Oral Anatomy and Histology
Dental Materials
Periodontology
Microbiology and Pathology
Community Dental Health
Radiology Principles
Pharmacology
Patient Management and Ethics
Preventive Dentistry
1. Which structure anchors the tooth to the alveolar bone through connective
tissue fibers?
A. Cementum
B. Periodontal ligament
C. Enamel
D. Pulp
Answer: B. Periodontal ligament
Explanation: The periodontal ligament contains connective tissue fibers that
attach the cementum of the tooth to the alveolar bone, allowing slight movement
and acting as a shock absorber.
2. The hardest substance in the human body is:
A. Dentin
B. Enamel
C. Cementum
D. Bone
,Answer: B. Enamel
Explanation: Enamel is highly mineralized (about 96% inorganic material) and
provides protection to underlying dentin and pulp.
3. Dental plaque is best described as:
A. A calcified deposit on enamel
B. A biofilm composed of microorganisms
C. A food debris layer
D. A stain on the tooth surface
Answer: B. A biofilm composed of microorganisms
Explanation: Plaque is a structured microbial biofilm adhering to tooth surfaces
and is the primary etiologic factor in caries and periodontal disease.
4. Which radiographic error results in overlapping of interproximal contacts?
A. Incorrect vertical angulation
B. Incorrect horizontal angulation
C. Excessive exposure time
D. Improper film placement
Answer: B. Incorrect horizontal angulation
Explanation: Improper horizontal angulation causes the X-ray beam to not pass
directly through contact points, leading to overlap.
5. The primary etiologic factor in gingivitis is:
A. Trauma
B. Plaque accumulation
C. Nutritional deficiency
D. Genetic mutation
Answer: B. Plaque accumulation
Explanation: Bacterial plaque accumulation at the gingival margin initiates
inflammatory response leading to gingivitis.
6. Which vitamin deficiency most commonly results in bleeding gums?
A. Vitamin A
B. Vitamin C
, C. Vitamin D
D. Vitamin K
Answer: B. Vitamin C
Explanation: Vitamin C deficiency (scurvy) impairs collagen formation and leads to
fragile capillaries and bleeding gingiva.
7. Which dental material is most commonly used for posterior restorations
due to its strength and durability?
A. Composite resin
B. Glass ionomer
C. Dental amalgam
D. Zinc oxide eugenol
Answer: C. Dental amalgam
Explanation: Amalgam is highly durable and resistant to wear, making it suitable
for posterior restorations with high occlusal stress.
8. The microorganism most strongly associated with dental caries initiation is:
A. Streptococcus mutans
B. Lactobacillus acidophilus
C. Actinomyces israelii
D. Candida albicans
Answer: A. Streptococcus mutans
Explanation: Streptococcus mutans metabolizes sugars into acids that
demineralize enamel and initiate caries.
9. The pulp of the tooth primarily contains:
A. Bone and enamel
B. Blood vessels and nerves
C. Cementum and dentin
D. Salivary glands
Answer: B. Blood vessels and nerves
Explanation: Dental pulp is a soft connective tissue containing nerves, blood
vessels, and odontoblasts.
