HESI DENTAL HYGIENE EXAM 2 LATEST VERSIONS
2025/DENTAL HYGIENE HESI EXAM 400+ QUESTIONS AND
CORRECT ANSWERS|ALREADY GRADED A+
Question 1
Which of the following describes the correct angulation for the working end
of a universal curet on a tooth surface during instrumentation?
A) 0-40 degrees
B) 45-90 degrees
C) 70-80 degrees
D) 60-70 degrees
E) 90 degrees
Correct Answer: D) 60-70 degrees
Rationale: For optimal calculus removal and minimal tissue trauma
with a universal curet, the angulation of the blade to the tooth
surface should be between 60-70 degrees. Angles less than 45
degrees are for debridement, and greater than 90 degrees can
cause tissue trauma.
Question 2
What is the primary goal of meticulous oral hygiene for a patient undergoing
orthodontic treatment?
A) To prevent bracket debonding.
B) To reduce the risk of gingival inflammation and decalcification.
C) To shorten the overall treatment time.
D) To eliminate the need for fluoride varnish.
E) To improve appliance aesthetics.
Correct Answer: B) To reduce the risk of gingival inflammation and
decalcification.
Rationale: Orthodontic appliances create numerous plaque traps,
increasing the risk of gingivitis and white spot lesions
(decalcification). Excellent oral hygiene is crucial to prevent these
common complications during treatment.
Question 3
Which component of local anesthetic is responsible for the vasoconstrictive
action, prolonging anesthesia and reducing bleeding?
A) Amide portion
B) Ester portion
C) Sodium bisulfite
D) Epinephrine
E) Distilled water
Correct Answer: D) Epinephrine
,Rationale: Epinephrine is the most common vasoconstrictor added
to local anesthetics. It constricts blood vessels, which decreases
systemic absorption of the anesthetic (prolonging its effect),
reduces bleeding at the injection site, and lowers the risk of
systemic toxicity.
Question 4
A patient presents with a localized, well-demarcated area of gingival
inflammation and bleeding in the anterior mandibular region. Radiographs
show no bone loss. What is the most likely diagnosis?
A) Generalized aggressive periodontitis
B) Localized chronic periodontitis
C) Gingivitis
D) Necrotizing ulcerative gingivitis (NUG)
E) Peri-implantitis
Correct Answer: C) Gingivitis
Rationale: Gingivitis is characterized by inflammation and bleeding
of the gingiva without clinical attachment loss or radiographic bone
loss. The localized nature described fits. Periodontitis involves
attachment and bone loss. NUG has distinct features like punched-
out papilla and pain.
Question 5
What is the primary advantage of using ultrasonic or sonic scalers over hand
scalers for calculus removal?
A) Better tactile sensitivity.
B) Less aerosol production.
C) Requires no water coolant.
D) More efficient for heavy calculus and can debride furcations.
E) Eliminates the need for local anesthesia.
Correct Answer: D) More efficient for heavy calculus and can debride
furcations.
Rationale: Ultrasonic/sonic scalers are highly efficient for removing
moderate to heavy calculus deposits, especially in complex areas
like furcations, due to their rapid vibrations and cavitational effects.
They also require water coolant and produce aerosols.
Question 6
Which type of periodontal surgery involves reshaping the bone to achieve a
more physiological contour?
A) Gingivectomy
,B) Frenectomy
C) Ostectomy
D) Gingivoplasty
E) Root resection
Correct Answer: C) Ostectomy
Rationale: Ostectomy is the surgical removal of alveolar bone (bone
resection) to correct bony defects and establish a more physiologic
contour that facilitates plaque control. Gingivoplasty reshapes only
the gingiva. Gingivectomy removes gingival tissue.
Question 7
During a medical history review, a patient indicates they take warfarin
(Coumadin). What is the primary concern for the dental hygienist?
A) Increased risk of infection.
B) Impaired wound healing.
C) Increased risk of bleeding.
D) Decreased effectiveness of local anesthesia.
E) Increased risk of allergic reaction.
Correct Answer: C) Increased risk of bleeding.
Rationale: Warfarin is an anticoagulant (blood thinner). Patients
taking warfarin have an increased risk of excessive bleeding during
and after dental procedures, especially invasive ones. INR levels
should be checked before invasive procedures.
Question 8
What is the purpose of the light-cured resin in a dental sealant?
A) To chemically bond to the tooth structure.
B) To etch the enamel surface.
C) To act as a protective barrier against caries by physically blocking pits and
fissures.
D) To desensitize the tooth.
E) To release fluoride into the tooth.
Correct Answer: C) To act as a protective barrier against caries by
physically blocking pits and fissures.
Rationale: Dental sealants physically fill and cover the pits and
fissures of occlusal surfaces, preventing bacteria and food debris
from accumulating in these areas and thus preventing caries. The
light cures the resin.
Question 9
Which of the following teeth is most likely to exhibit a Class II furcation
, involvement?
A) Maxillary central incisor
B) Mandibular second premolar
C) Maxillary first molar
D) Mandibular first incisor
E) Maxillary canine
Correct Answer: C) Maxillary first molar
Rationale: Maxillary molars (especially first molars) have three roots
(mesiobuccal, distobuccal, palatal) and therefore three furcations,
making them highly susceptible to furcation involvement. Class II
refers to partial bone loss in the furcation.
Question 10
What is the recommended duration for handwashing with soap and water in
a dental setting to effectively remove transient microorganisms?
A) 5 seconds
B) 10 seconds
C) 15-20 seconds
D) 30 seconds
E) 1 minute
Correct Answer: C) 15-20 seconds
Rationale: According to CDC guidelines, vigorous handwashing with
soap and water for at least 15-20 seconds is recommended to
effectively remove transient microorganisms and reduce the risk of
cross-contamination.
Question 11
A patient presents with halitosis, taste alteration, and a white, cheesy plaque
on the dorsal surface of the tongue that can be easily wiped away. What is
the most likely condition?
A) Geographic tongue
B) Hairy leukoplakia
C) Oral candidiasis (thrush)
D) Fissured tongue
E) Leukoplakia
Correct Answer: C) Oral candidiasis (thrush)
Rationale: Oral candidiasis, caused by Candida albicans, typically
presents as white, cottage cheese-like plaques that can be wiped
away, often leaving an erythematous base. Halitosis and taste
alteration are common symptoms.
2025/DENTAL HYGIENE HESI EXAM 400+ QUESTIONS AND
CORRECT ANSWERS|ALREADY GRADED A+
Question 1
Which of the following describes the correct angulation for the working end
of a universal curet on a tooth surface during instrumentation?
A) 0-40 degrees
B) 45-90 degrees
C) 70-80 degrees
D) 60-70 degrees
E) 90 degrees
Correct Answer: D) 60-70 degrees
Rationale: For optimal calculus removal and minimal tissue trauma
with a universal curet, the angulation of the blade to the tooth
surface should be between 60-70 degrees. Angles less than 45
degrees are for debridement, and greater than 90 degrees can
cause tissue trauma.
Question 2
What is the primary goal of meticulous oral hygiene for a patient undergoing
orthodontic treatment?
A) To prevent bracket debonding.
B) To reduce the risk of gingival inflammation and decalcification.
C) To shorten the overall treatment time.
D) To eliminate the need for fluoride varnish.
E) To improve appliance aesthetics.
Correct Answer: B) To reduce the risk of gingival inflammation and
decalcification.
Rationale: Orthodontic appliances create numerous plaque traps,
increasing the risk of gingivitis and white spot lesions
(decalcification). Excellent oral hygiene is crucial to prevent these
common complications during treatment.
Question 3
Which component of local anesthetic is responsible for the vasoconstrictive
action, prolonging anesthesia and reducing bleeding?
A) Amide portion
B) Ester portion
C) Sodium bisulfite
D) Epinephrine
E) Distilled water
Correct Answer: D) Epinephrine
,Rationale: Epinephrine is the most common vasoconstrictor added
to local anesthetics. It constricts blood vessels, which decreases
systemic absorption of the anesthetic (prolonging its effect),
reduces bleeding at the injection site, and lowers the risk of
systemic toxicity.
Question 4
A patient presents with a localized, well-demarcated area of gingival
inflammation and bleeding in the anterior mandibular region. Radiographs
show no bone loss. What is the most likely diagnosis?
A) Generalized aggressive periodontitis
B) Localized chronic periodontitis
C) Gingivitis
D) Necrotizing ulcerative gingivitis (NUG)
E) Peri-implantitis
Correct Answer: C) Gingivitis
Rationale: Gingivitis is characterized by inflammation and bleeding
of the gingiva without clinical attachment loss or radiographic bone
loss. The localized nature described fits. Periodontitis involves
attachment and bone loss. NUG has distinct features like punched-
out papilla and pain.
Question 5
What is the primary advantage of using ultrasonic or sonic scalers over hand
scalers for calculus removal?
A) Better tactile sensitivity.
B) Less aerosol production.
C) Requires no water coolant.
D) More efficient for heavy calculus and can debride furcations.
E) Eliminates the need for local anesthesia.
Correct Answer: D) More efficient for heavy calculus and can debride
furcations.
Rationale: Ultrasonic/sonic scalers are highly efficient for removing
moderate to heavy calculus deposits, especially in complex areas
like furcations, due to their rapid vibrations and cavitational effects.
They also require water coolant and produce aerosols.
Question 6
Which type of periodontal surgery involves reshaping the bone to achieve a
more physiological contour?
A) Gingivectomy
,B) Frenectomy
C) Ostectomy
D) Gingivoplasty
E) Root resection
Correct Answer: C) Ostectomy
Rationale: Ostectomy is the surgical removal of alveolar bone (bone
resection) to correct bony defects and establish a more physiologic
contour that facilitates plaque control. Gingivoplasty reshapes only
the gingiva. Gingivectomy removes gingival tissue.
Question 7
During a medical history review, a patient indicates they take warfarin
(Coumadin). What is the primary concern for the dental hygienist?
A) Increased risk of infection.
B) Impaired wound healing.
C) Increased risk of bleeding.
D) Decreased effectiveness of local anesthesia.
E) Increased risk of allergic reaction.
Correct Answer: C) Increased risk of bleeding.
Rationale: Warfarin is an anticoagulant (blood thinner). Patients
taking warfarin have an increased risk of excessive bleeding during
and after dental procedures, especially invasive ones. INR levels
should be checked before invasive procedures.
Question 8
What is the purpose of the light-cured resin in a dental sealant?
A) To chemically bond to the tooth structure.
B) To etch the enamel surface.
C) To act as a protective barrier against caries by physically blocking pits and
fissures.
D) To desensitize the tooth.
E) To release fluoride into the tooth.
Correct Answer: C) To act as a protective barrier against caries by
physically blocking pits and fissures.
Rationale: Dental sealants physically fill and cover the pits and
fissures of occlusal surfaces, preventing bacteria and food debris
from accumulating in these areas and thus preventing caries. The
light cures the resin.
Question 9
Which of the following teeth is most likely to exhibit a Class II furcation
, involvement?
A) Maxillary central incisor
B) Mandibular second premolar
C) Maxillary first molar
D) Mandibular first incisor
E) Maxillary canine
Correct Answer: C) Maxillary first molar
Rationale: Maxillary molars (especially first molars) have three roots
(mesiobuccal, distobuccal, palatal) and therefore three furcations,
making them highly susceptible to furcation involvement. Class II
refers to partial bone loss in the furcation.
Question 10
What is the recommended duration for handwashing with soap and water in
a dental setting to effectively remove transient microorganisms?
A) 5 seconds
B) 10 seconds
C) 15-20 seconds
D) 30 seconds
E) 1 minute
Correct Answer: C) 15-20 seconds
Rationale: According to CDC guidelines, vigorous handwashing with
soap and water for at least 15-20 seconds is recommended to
effectively remove transient microorganisms and reduce the risk of
cross-contamination.
Question 11
A patient presents with halitosis, taste alteration, and a white, cheesy plaque
on the dorsal surface of the tongue that can be easily wiped away. What is
the most likely condition?
A) Geographic tongue
B) Hairy leukoplakia
C) Oral candidiasis (thrush)
D) Fissured tongue
E) Leukoplakia
Correct Answer: C) Oral candidiasis (thrush)
Rationale: Oral candidiasis, caused by Candida albicans, typically
presents as white, cottage cheese-like plaques that can be wiped
away, often leaving an erythematous base. Halitosis and taste
alteration are common symptoms.
