Mosby's Review for NBDHE 2026/2027 | Dental Hygiene Knowledge
Exam Prep | Practice Questions & Answers
1. Which question is appropriate for you to ask a patient as part of the first step
in the Ask-Advise-Refer method?
Do you smoke or use tobacco products?
Did you call 1-877-44U-QUIT?
How is your attempt to quit smoking going?
Are you having problems with withdrawal symptoms or cravings?
2. A patient comes into the emergency room with the following symptoms:
lethargy, cold, sweating, and pallor. The patient mumbles to you that they are
a type 1 diabetic. The patient is likely experiencing...
Dawn Phenomenon
Hypotension
Hyperglycemia
Hypoglycemia
3. What is the normal respiration rate for adults measured in breaths per
minute?
8-10
22-27
12-20
28-32
4. Describe the role of tungsten in the function of an x-ray tube.
, Tungsten is primarily used for its electrical conductivity in the x-ray
tube.
Tungsten is used to enhance the color of the x-ray images.
Tungsten is a component that helps in the filtration of x-rays.
Tungsten is used in the x-ray tube because of its high melting point
and ability to produce x-rays efficiently.
5. What is the medical term for fainting or loss of consciousness due to a
temporary drop in blood flow to the brain?
Cardiac arrest
Shock
Syncope
Angina pectoris
6. Oral candidiasis is the most common oral lesion associated with HIV. An
individual with HIV should be instructed to rinse with hydrogen peroxide
daily to lessen the chance that he or she will develop candidiasis.
The first statement is false, and the second statement is true.
Both statements are true.
The first statement is true, and the second statement is false.
Both statements are false.
7. What is the procedure that follows the active phase of periodontal treatment
to assess patient needs?
Periodic examination
Restorative treatment
, Periodontal maintenance
Medical update
8. Oral/mucosal candidiasis was observed and documented in the first cases of
HIV/AIDS. Oral health is, therefore an important component of HIV disease.
Both statements are true.
The first statement is true, the second is false.
Both statements are false.
The first statement is false, the second is true.
9. What is a common psychological response that can occur during dental
procedures, particularly in patients who have not visited a dentist in several
years?
Nausea
Allergic reaction
Anxiety
Myocardial infarction (MI)
10. Which of the following blood pressure readings can be classified as
hypertension, stage 1?
120/80 mm Hg
111/78 mm Hg
144/92 mm Hg
130/88 mm Hg
11. Contraindications to the administration of nitrous-oxide sedation include
, COPD
Asthma
Neurotic behaviour treated by verbal therapy
Severe respiratory infection
12. Describe why 2.5% lidocaine and prilocaine gel is preferred for scaling and
root planing compared to other anesthetics.
2.5% lidocaine spray is preferred for its ease of application.
2.5% lidocaine ointment is preferred for its moisturizing properties.
2.5% lidocaine and prilocaine gel is preferred because it provides
effective pain control and has a longer duration of action.
20% benzocaine gel is preferred due to its rapid onset of action.
13. What percentage of alcohol can be used as an antiseptic for the skin?
Less than 40%
Less than 20%
At least 90%
At least 70%
14. What is the pH threshold level at which enamel demineralization occurs?
5.5
4.5
6.5
Exam Prep | Practice Questions & Answers
1. Which question is appropriate for you to ask a patient as part of the first step
in the Ask-Advise-Refer method?
Do you smoke or use tobacco products?
Did you call 1-877-44U-QUIT?
How is your attempt to quit smoking going?
Are you having problems with withdrawal symptoms or cravings?
2. A patient comes into the emergency room with the following symptoms:
lethargy, cold, sweating, and pallor. The patient mumbles to you that they are
a type 1 diabetic. The patient is likely experiencing...
Dawn Phenomenon
Hypotension
Hyperglycemia
Hypoglycemia
3. What is the normal respiration rate for adults measured in breaths per
minute?
8-10
22-27
12-20
28-32
4. Describe the role of tungsten in the function of an x-ray tube.
, Tungsten is primarily used for its electrical conductivity in the x-ray
tube.
Tungsten is used to enhance the color of the x-ray images.
Tungsten is a component that helps in the filtration of x-rays.
Tungsten is used in the x-ray tube because of its high melting point
and ability to produce x-rays efficiently.
5. What is the medical term for fainting or loss of consciousness due to a
temporary drop in blood flow to the brain?
Cardiac arrest
Shock
Syncope
Angina pectoris
6. Oral candidiasis is the most common oral lesion associated with HIV. An
individual with HIV should be instructed to rinse with hydrogen peroxide
daily to lessen the chance that he or she will develop candidiasis.
The first statement is false, and the second statement is true.
Both statements are true.
The first statement is true, and the second statement is false.
Both statements are false.
7. What is the procedure that follows the active phase of periodontal treatment
to assess patient needs?
Periodic examination
Restorative treatment
, Periodontal maintenance
Medical update
8. Oral/mucosal candidiasis was observed and documented in the first cases of
HIV/AIDS. Oral health is, therefore an important component of HIV disease.
Both statements are true.
The first statement is true, the second is false.
Both statements are false.
The first statement is false, the second is true.
9. What is a common psychological response that can occur during dental
procedures, particularly in patients who have not visited a dentist in several
years?
Nausea
Allergic reaction
Anxiety
Myocardial infarction (MI)
10. Which of the following blood pressure readings can be classified as
hypertension, stage 1?
120/80 mm Hg
111/78 mm Hg
144/92 mm Hg
130/88 mm Hg
11. Contraindications to the administration of nitrous-oxide sedation include
, COPD
Asthma
Neurotic behaviour treated by verbal therapy
Severe respiratory infection
12. Describe why 2.5% lidocaine and prilocaine gel is preferred for scaling and
root planing compared to other anesthetics.
2.5% lidocaine spray is preferred for its ease of application.
2.5% lidocaine ointment is preferred for its moisturizing properties.
2.5% lidocaine and prilocaine gel is preferred because it provides
effective pain control and has a longer duration of action.
20% benzocaine gel is preferred due to its rapid onset of action.
13. What percentage of alcohol can be used as an antiseptic for the skin?
Less than 40%
Less than 20%
At least 90%
At least 70%
14. What is the pH threshold level at which enamel demineralization occurs?
5.5
4.5
6.5
