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NBDHE Exam Version 1 / National Board Dental
Hygiene Examination Newest 2026/2027 Complete
Questions And Correct Detailed Answers (Verified
Answer S) |Brand New Version!!
The junctional epithelium attaches to the tooth at which structure?
A. Cementoenamel junction
B. Free gingival groove
C. Internal basal lamina and hemidesmosomes
D. Cortical plate
ANSWER : C
Which vitamin deficiency is associated with impaired wound healing
and bleeding gums? A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
ANSWER : C
What is the primary purpose of the rubber dam in dental procedures?
A. Reduce gagging
B. Control moisture and isolate the field
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C. Protect gingival tissues
D. Provide anesthesia
ANSWER : B
The “incubation period” of a disease refers to:
A. Period between exposure and clinical symptoms
B. Time when symptoms are at their peak
C. Period when patient recovers
D. Period when host is immune
ANSWER : A
Which type of immunity results from vaccination?
A. Natural active
B. Natural passive
C. Artificial active
D. Artificial passive
ANSWER : C
Which tooth surface is MOST affected by early childhood caries?
A. Mandibular first molars
B. Maxillary incisors
C. Mandibular incisors
D. Mandibular canines
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ANSWER : B
What does the DMFT index measure?
A. Decayed, missing, and filled teeth
B. Decayed, missing, and fractured teeth
C. Dental mobility and function test
D. Denture maintenance frequency test
ANSWER : A
The primary etiologic factor in gingivitis is:
A. Calculus
B. Bacteria in dental plaque
C. Trauma
D. Vitamin deficiency
ANSWER : B
What is the drug of choice for a patient with penicillin allergy requiring
antibiotic prophylaxis?
A. Amoxicillin
B. Cephalexin
C. Clindamycin
D. Erythromycin
ANSWER : C
Which local anesthetic has the longest duration of action?
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A. Mepivacaine
B. Lidocaine
C. Articaine
D. Bupivacaine
ANSWER : D
Which periodontal fiber group resists vertical and intrusive forces?
A. Horizontal fibers
B. Alveolar crest fibers
C. Oblique fibers
D. Interradicular fibers
ANSWER : C
The primary mode of transmission of tuberculosis is:
A. Saliva
B. Blood
C. Airborne droplets
D. Fomites
ANSWER : C
Which of the following indices measures gingival bleeding after
probing?
A. OHI-S
B. SBI
NBDHE Exam Version 1 / National Board Dental
Hygiene Examination Newest 2026/2027 Complete
Questions And Correct Detailed Answers (Verified
Answer S) |Brand New Version!!
The junctional epithelium attaches to the tooth at which structure?
A. Cementoenamel junction
B. Free gingival groove
C. Internal basal lamina and hemidesmosomes
D. Cortical plate
ANSWER : C
Which vitamin deficiency is associated with impaired wound healing
and bleeding gums? A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
ANSWER : C
What is the primary purpose of the rubber dam in dental procedures?
A. Reduce gagging
B. Control moisture and isolate the field
,2 | Page
C. Protect gingival tissues
D. Provide anesthesia
ANSWER : B
The “incubation period” of a disease refers to:
A. Period between exposure and clinical symptoms
B. Time when symptoms are at their peak
C. Period when patient recovers
D. Period when host is immune
ANSWER : A
Which type of immunity results from vaccination?
A. Natural active
B. Natural passive
C. Artificial active
D. Artificial passive
ANSWER : C
Which tooth surface is MOST affected by early childhood caries?
A. Mandibular first molars
B. Maxillary incisors
C. Mandibular incisors
D. Mandibular canines
,3 | Page
ANSWER : B
What does the DMFT index measure?
A. Decayed, missing, and filled teeth
B. Decayed, missing, and fractured teeth
C. Dental mobility and function test
D. Denture maintenance frequency test
ANSWER : A
The primary etiologic factor in gingivitis is:
A. Calculus
B. Bacteria in dental plaque
C. Trauma
D. Vitamin deficiency
ANSWER : B
What is the drug of choice for a patient with penicillin allergy requiring
antibiotic prophylaxis?
A. Amoxicillin
B. Cephalexin
C. Clindamycin
D. Erythromycin
ANSWER : C
Which local anesthetic has the longest duration of action?
, 4 | Page
A. Mepivacaine
B. Lidocaine
C. Articaine
D. Bupivacaine
ANSWER : D
Which periodontal fiber group resists vertical and intrusive forces?
A. Horizontal fibers
B. Alveolar crest fibers
C. Oblique fibers
D. Interradicular fibers
ANSWER : C
The primary mode of transmission of tuberculosis is:
A. Saliva
B. Blood
C. Airborne droplets
D. Fomites
ANSWER : C
Which of the following indices measures gingival bleeding after
probing?
A. OHI-S
B. SBI
