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NBDHE Exam Version 1 / National Board Dental
Hygiene Examination Newest 2025/2026 Complete
Questions And Correct Detailed Answers (Verified
Answers) |Brand New Version!!
A patient presents with generalized gingival inflammation, bleeding on
probing, and no radiographic bone loss. Which of the following best
describes this condition?
A. Chronic periodontitis
B. Aggressive periodontitis
C. Gingivitis
D. Necrotizing ulcerative periodontitis
Answer: C
Which of the following bacteria is most associated with chronic
periodontitis?
A. Streptococcus mutans
B. Porphyromonas gingivalis
C. Actinomyces viscosus
D. Staphylococcus aureus
Answer: B
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Which fluoride concentration is most commonly found in professionally
applied neutral sodium fluoride varnish?
A. 0.05%
B. 1.23%
C. 2%
D. 5%
Answer: D
What is the primary side effect of chlorhexidine gluconate mouthrinse?
A. Caries reduction
B. Extrinsic staining
C. Xerostomia
D. Tooth sensitivity
Answer: B
The most common site for oral squamous cell carcinoma is:
A. Hard palate
B. Floor of the mouth
C. Dorsum of the tongue
D. Gingiva
Answer: B
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Which of the following is the first step in the dental hygiene process of
care?
A. Planning
B. Assessment
C. Implementation
D. Evaluation
Answer: B
Which gracey curet is designed to scale the mesial surfaces of posterior
teeth?
A. 11/12
B. 13/14
C. 1/2
D. 7/8
Answer: A
Which tooth surface is most susceptible to caries in children?
A. Mandibular incisal edges
B. Maxillary posterior occlusal surfaces
C. Mandibular posterior occlusal surfaces
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D. Maxillary anterior lingual surfaces
Answer: C
The recommended level of community water fluoridation in the U.S. is
approximately:
A. 0.3 ppm
B. 0.7 ppm
C. 1.5 ppm
D. 2.0 ppm
Answer: B
Which instrument is BEST suited for detecting subgingival calculus
deposits?
A. Periodontal probe
B. Shepherd’s hook explorer
C. 11/12 explorer
D. Straight explorer
Answer: C
The junctional epithelium attaches to the tooth at which structure?
A. Cementoenamel junction
B. Free gingival groove
NBDHE Exam Version 1 / National Board Dental
Hygiene Examination Newest 2025/2026 Complete
Questions And Correct Detailed Answers (Verified
Answers) |Brand New Version!!
A patient presents with generalized gingival inflammation, bleeding on
probing, and no radiographic bone loss. Which of the following best
describes this condition?
A. Chronic periodontitis
B. Aggressive periodontitis
C. Gingivitis
D. Necrotizing ulcerative periodontitis
Answer: C
Which of the following bacteria is most associated with chronic
periodontitis?
A. Streptococcus mutans
B. Porphyromonas gingivalis
C. Actinomyces viscosus
D. Staphylococcus aureus
Answer: B
,2|Page
Which fluoride concentration is most commonly found in professionally
applied neutral sodium fluoride varnish?
A. 0.05%
B. 1.23%
C. 2%
D. 5%
Answer: D
What is the primary side effect of chlorhexidine gluconate mouthrinse?
A. Caries reduction
B. Extrinsic staining
C. Xerostomia
D. Tooth sensitivity
Answer: B
The most common site for oral squamous cell carcinoma is:
A. Hard palate
B. Floor of the mouth
C. Dorsum of the tongue
D. Gingiva
Answer: B
,3|Page
Which of the following is the first step in the dental hygiene process of
care?
A. Planning
B. Assessment
C. Implementation
D. Evaluation
Answer: B
Which gracey curet is designed to scale the mesial surfaces of posterior
teeth?
A. 11/12
B. 13/14
C. 1/2
D. 7/8
Answer: A
Which tooth surface is most susceptible to caries in children?
A. Mandibular incisal edges
B. Maxillary posterior occlusal surfaces
C. Mandibular posterior occlusal surfaces
, 4|Page
D. Maxillary anterior lingual surfaces
Answer: C
The recommended level of community water fluoridation in the U.S. is
approximately:
A. 0.3 ppm
B. 0.7 ppm
C. 1.5 ppm
D. 2.0 ppm
Answer: B
Which instrument is BEST suited for detecting subgingival calculus
deposits?
A. Periodontal probe
B. Shepherd’s hook explorer
C. 11/12 explorer
D. Straight explorer
Answer: C
The junctional epithelium attaches to the tooth at which structure?
A. Cementoenamel junction
B. Free gingival groove
