NDHCE Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A
1. Which of the following fluoride agents is most commonly used in
| | | | | | | | | |
|community water fluoridation? | |
a) Stannous fluoride |
b) Sodium monofluorophosphate
|
c) Hydrofluorosilicic acid |
d) Acidulated phosphate fluoride | |
Hydrofluorosilicic acid is the most frequently used compound in
| | | | | | | |
|community water fluoridation because of its stability, cost-
| | | | | | |
|effectiveness, and ease of use. | | | |
2. Which instrument is best suited for the removal of supragingival
| | | | | | | | |
|calculus in the anterior region?
| | | |
a) Gracey 11/12 curet
| |
, b) Universal curet |
c) Sickle scaler |
d) Hoe scaler
|
Sickle scalers have a pointed tip and are designed for supragingival
| | | | | | | | | |
calculus removal, especially in anterior teeth and proximal areas.
| | | | | | | | |
3. Which radiographic error results in a cone-cut appearance?
| | | | | | |
a) Improper positioning of the PID | | | |
b) Insufficient vertical angulation | |
c) Film placed backwards
| |
d) Patient movement |
A cone-cut occurs when the x-ray beam does not cover the entire
| | | | | | | | | | |
receptor because of misaligned positioning of the PID.
| | | | | | | |
4. Which bacteria is primarily responsible for dental caries?
| | | | | | |
a) Actinomyces viscosus |
b) Streptococcus mutans |
c) Porphyromonas gingivalis |
d) Treponema denticola |
Streptococcus mutans is the main pathogen associated with the
| | | | | | | |
initiation of dental caries.
| | | |
5. What is the first step in the dental hygiene process of care?
| | | | | | | | | | |
a) Planning
b) Implementation
c) Assessment
, d) Evaluation
Assessment is the foundation step that involves collecting data on the
| | | | | | | | | |
patient’s health, dental history, and risk factors.
| | | | | | |
6. Which drug is most likely to cause gingival hyperplasia?
| | | | | | | |
a) Tetracycline
b) Metronidazole
c) Phenytoin
d) Aspirin
Phenytoin, an anticonvulsant, is well known for causing gingival
| | | | | | | |
hyperplasia.
|
7. The primary goal of dental sealants is to:
| | | | | | |
a) Remineralize enamel |
b) Prevent pit and fissure caries | | | |
c) Whiten stained fissures | |
d) Replace lost enamel | |
Sealants act as a physical barrier to protect susceptible pits and
| | | | | | | | | |
fissures from bacterial accumulation and acid attack.
| | | | | | |
8. What does informed consent require?
| | | |
a) Patient signs a written contract
| | | |
b) Patient is fully informed of risks, benefits, and alternatives
| | | | | | | |
c) Patient agrees verbally only
| | |
d) Provider documents only treatment | | |
Informed consent means the patient is given full disclosure about
| | | | | | | | |
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A
1. Which of the following fluoride agents is most commonly used in
| | | | | | | | | |
|community water fluoridation? | |
a) Stannous fluoride |
b) Sodium monofluorophosphate
|
c) Hydrofluorosilicic acid |
d) Acidulated phosphate fluoride | |
Hydrofluorosilicic acid is the most frequently used compound in
| | | | | | | |
|community water fluoridation because of its stability, cost-
| | | | | | |
|effectiveness, and ease of use. | | | |
2. Which instrument is best suited for the removal of supragingival
| | | | | | | | |
|calculus in the anterior region?
| | | |
a) Gracey 11/12 curet
| |
, b) Universal curet |
c) Sickle scaler |
d) Hoe scaler
|
Sickle scalers have a pointed tip and are designed for supragingival
| | | | | | | | | |
calculus removal, especially in anterior teeth and proximal areas.
| | | | | | | | |
3. Which radiographic error results in a cone-cut appearance?
| | | | | | |
a) Improper positioning of the PID | | | |
b) Insufficient vertical angulation | |
c) Film placed backwards
| |
d) Patient movement |
A cone-cut occurs when the x-ray beam does not cover the entire
| | | | | | | | | | |
receptor because of misaligned positioning of the PID.
| | | | | | | |
4. Which bacteria is primarily responsible for dental caries?
| | | | | | |
a) Actinomyces viscosus |
b) Streptococcus mutans |
c) Porphyromonas gingivalis |
d) Treponema denticola |
Streptococcus mutans is the main pathogen associated with the
| | | | | | | |
initiation of dental caries.
| | | |
5. What is the first step in the dental hygiene process of care?
| | | | | | | | | | |
a) Planning
b) Implementation
c) Assessment
, d) Evaluation
Assessment is the foundation step that involves collecting data on the
| | | | | | | | | |
patient’s health, dental history, and risk factors.
| | | | | | |
6. Which drug is most likely to cause gingival hyperplasia?
| | | | | | | |
a) Tetracycline
b) Metronidazole
c) Phenytoin
d) Aspirin
Phenytoin, an anticonvulsant, is well known for causing gingival
| | | | | | | |
hyperplasia.
|
7. The primary goal of dental sealants is to:
| | | | | | |
a) Remineralize enamel |
b) Prevent pit and fissure caries | | | |
c) Whiten stained fissures | |
d) Replace lost enamel | |
Sealants act as a physical barrier to protect susceptible pits and
| | | | | | | | | |
fissures from bacterial accumulation and acid attack.
| | | | | | |
8. What does informed consent require?
| | | |
a) Patient signs a written contract
| | | |
b) Patient is fully informed of risks, benefits, and alternatives
| | | | | | | |
c) Patient agrees verbally only
| | |
d) Provider documents only treatment | | |
Informed consent means the patient is given full disclosure about
| | | | | | | | |
