DANB Practice Test for the Dental Assistant (2025–2026
Edition) — Complete Exam Material with Correct
Answers
Introduction:
This document contains a comprehensive collection of practice
questions and correct answers for the 2025–2026 DANB (Dental
Assisting National Board) exam. It covers all key areas of dental
assisting, including anatomy, infection control, radiography,
chairside assisting, dental materials, oral surgery, endodontics,
orthodontics, pediatric dentistry, and preventive care. Designed to
mirror the official DANB exam format, it provides both multiple-
choice questions and detailed answer keys to help students prepare
effectively.
Exam Questions and Answers
35. Which of the following is not a contraindication for the use of
N2O2?
a. Anemia
b. Pregnancy
c. Common cold
d. Emphysema--- correct precise answer --- a. Anemia
36. What part of the gas machine houses the nitrous oxide and
oxygen to combine them together
for the patient to breathe?
a. Gas hose
,b. Reservoir bag
c. Flowmeter
d. Mask--- correct precise answer --- b. Reservoir bag
37. Nitrous oxide has been used on a patient. For how many
minutes afterward should the patient
remain on 100% Oxygen?. a. 1
b. 2
c. 5
d. 10--- correct precise answer --- c. 5
38. Which of the following is an approved method by the Center
for Disease Control for re-capping a
used needle?
a. Using a recapping device
b. Single-handed swoop
c. Both a and b
d. None of the above--- correct precise answer --- c. Both a and b
39. A long needle, 1 5/8" in length, is used for what type of
injections?
a. Infiltration
b. Periodontal ligament
c. Block
d. All of the above.--- correct precise answer --- c. Block
,40. What type of injection involves the tissues near the apex of a
tooth?
a. Field block
b. Nerve block
c. Nasopalatine
d. Infiltration--- correct precise answer --- d. Infiltration
41. Which of the following is NOT a health concern when it comes
to selecting the appropriate form
of local anesthetic?
a. Pregnancy
b. Joint replacement
c. Elevated blood pressure
d. Cardiovascular disease--- correct precise answer --- b. Joint
replacement
42. What is added to an anesthetic agent to lengthen the effect by
decreasing blood flow?
a. Vasoconstrictors
b. Vasodilators
c. Lidocaine
d. Septocaine--- correct precise answer --- a. Vasoconstrictors
43. How long should topical anesthetic be applied to the mucosa
prior to an injection?
a. 30-45 seconds
, b. 45-60 seconds
c. 2-5 minutes
d. 5-10 minutes--- correct precise answer --- c. 2-5 minutes
44. What may be added to burs in order to shorten preparation
time by improv- ing cutting ability?
a. Titanium
b. Coarse grit coating
c. Diamond stones
d. Inward slope--- correct precise answer --- c. Diamond stones
45. Which of the following burs would be appropriate for a
crown-prep setup tray?
a. Round bur
b. Flame-shaped bur
c. Round end taper bur
d. Pear bur--- correct precise answer --- b. Flame-shaped bur
46. Low speed handpieces are used for
a. Prophy angles
b. Round bur
c. Finishing bur
d. All of the above--- correct precise answer --- a. Prophy angles
47. What type of handpiece operates at speeds of up to 450,000
rpm?
Edition) — Complete Exam Material with Correct
Answers
Introduction:
This document contains a comprehensive collection of practice
questions and correct answers for the 2025–2026 DANB (Dental
Assisting National Board) exam. It covers all key areas of dental
assisting, including anatomy, infection control, radiography,
chairside assisting, dental materials, oral surgery, endodontics,
orthodontics, pediatric dentistry, and preventive care. Designed to
mirror the official DANB exam format, it provides both multiple-
choice questions and detailed answer keys to help students prepare
effectively.
Exam Questions and Answers
35. Which of the following is not a contraindication for the use of
N2O2?
a. Anemia
b. Pregnancy
c. Common cold
d. Emphysema--- correct precise answer --- a. Anemia
36. What part of the gas machine houses the nitrous oxide and
oxygen to combine them together
for the patient to breathe?
a. Gas hose
,b. Reservoir bag
c. Flowmeter
d. Mask--- correct precise answer --- b. Reservoir bag
37. Nitrous oxide has been used on a patient. For how many
minutes afterward should the patient
remain on 100% Oxygen?. a. 1
b. 2
c. 5
d. 10--- correct precise answer --- c. 5
38. Which of the following is an approved method by the Center
for Disease Control for re-capping a
used needle?
a. Using a recapping device
b. Single-handed swoop
c. Both a and b
d. None of the above--- correct precise answer --- c. Both a and b
39. A long needle, 1 5/8" in length, is used for what type of
injections?
a. Infiltration
b. Periodontal ligament
c. Block
d. All of the above.--- correct precise answer --- c. Block
,40. What type of injection involves the tissues near the apex of a
tooth?
a. Field block
b. Nerve block
c. Nasopalatine
d. Infiltration--- correct precise answer --- d. Infiltration
41. Which of the following is NOT a health concern when it comes
to selecting the appropriate form
of local anesthetic?
a. Pregnancy
b. Joint replacement
c. Elevated blood pressure
d. Cardiovascular disease--- correct precise answer --- b. Joint
replacement
42. What is added to an anesthetic agent to lengthen the effect by
decreasing blood flow?
a. Vasoconstrictors
b. Vasodilators
c. Lidocaine
d. Septocaine--- correct precise answer --- a. Vasoconstrictors
43. How long should topical anesthetic be applied to the mucosa
prior to an injection?
a. 30-45 seconds
, b. 45-60 seconds
c. 2-5 minutes
d. 5-10 minutes--- correct precise answer --- c. 2-5 minutes
44. What may be added to burs in order to shorten preparation
time by improv- ing cutting ability?
a. Titanium
b. Coarse grit coating
c. Diamond stones
d. Inward slope--- correct precise answer --- c. Diamond stones
45. Which of the following burs would be appropriate for a
crown-prep setup tray?
a. Round bur
b. Flame-shaped bur
c. Round end taper bur
d. Pear bur--- correct precise answer --- b. Flame-shaped bur
46. Low speed handpieces are used for
a. Prophy angles
b. Round bur
c. Finishing bur
d. All of the above--- correct precise answer --- a. Prophy angles
47. What type of handpiece operates at speeds of up to 450,000
rpm?
