Page 1 of 80
HESI Dental Hygiene EXAM with COMPLETE
QUESTIONS AND DETAILED SOLUTIONS /LATEST
UPDATE THIS YEAR/ JUST RELEASED/2026
Examination Coverage
• Periodontics (classification, etiology, treatment) •
• Oral Pathology & Oral Medicine
• Medical History & Systemic Disease Management
• Pharmacology & Local Anesthesia
• Dental Radiography & Image Interpretation
• Instrumentation & Clinical Techniques
• Patient Education & Preventive Care
• Infection Control & Medical Emergencies
• Dental Anatomy, Occlusion & Tooth Morphology
• Ethics, Legal & Professional Responsibility
• Nutrition, Caries Risk & Fluoride
, Page 2 of 80
Question 1
A 45-year-old patient presents with generalized attachment loss of 4-6 mm,
bleeding on probing, and radiographic bone loss affecting less than 30% of
sites. The patient is a non-smoker with no systemic conditions. According to
the AAP/EFP classification, which periodontal diagnosis is most appropriate?
A) Periodontitis Stage I Grade A
B) Periodontitis Stage II Grade B
C) Periodontitis Stage III Grade C
D) Necrotizing periodontal disease
CORRECT ANSWER: B) Periodontitis Stage II Grade B ✔
Rationale: Stage II periodontitis involves moderate attachment loss (3-4 mm
CAL) and bone loss in less than 30% of sites. Grade B indicates moderate
progression rate consistent with a non-smoker without diabetes.
Question 2
During subgingival scaling on a mandibular second molar, you encounter a
deep, narrow pocket on the distal surface that feels rougher than the
surrounding root. The patient reports occasional dull pain in that area. What
anatomical variation is most likely causing this clinical finding?
A) Enamel pearl
B) Cervical enamel projection extending into the furcation
C) Palatogingival groove
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D) Dilaceration of the root
CORRECT ANSWER: C) Palatogingival groove ✔
Rationale: A palatogingival groove is a developmental anomaly that occurs
most often on maxillary incisors, but similar distal grooves on mandibular
molars can trap plaque and cause localized periodontitis with a rough tactile
sensation.
Question 3
A dental hygiene student is calculating the ideal water flow rate for an
ultrasonic scaler to achieve maximum cavitation without causing thermal
damage to the pulp. Based on current research, which flow rate range
provides the optimal balance between cooling and biofilm disruption?
A) 2–5 mL/min
B) 10–15 mL/min
C) 20–45 mL/min
D) 50–75 mL/min
CORRECT ANSWER: C) 20–45 mL/min ✔
Rationale: Studies indicate that a water flow rate of 20–45 mL/min produces
effective cavitation and acoustic streaming while preventing overheating of
the tooth, soft tissue, and pulp.
Question 4
A patient with a history of mitral valve prolapse with regurgitation requires
periodontal debridement. According to the 2021 AHA guidelines, which
, Page 4 of 80
prophylactic regimen is indicated if the patient reports a severe allergy to
amoxicillin?
A) No prophylaxis is required for mitral valve prolapse
B) Clindamycin 600 mg orally 1 hour before the procedure
C) Azithromycin 500 mg orally 1 hour before the procedure
D) Cephalexin 2 g orally 30 minutes before the procedure
CORRECT ANSWER: A) No prophylaxis is required for mitral valve
prolapse ✔
Rationale: The 2021 AHA guidelines no longer recommend antibiotic
prophylaxis for mitral valve prolapse unless the patient has a prosthetic valve,
prior infective endocarditis, certain congenital heart diseases, or cardiac
transplant with valvulopathy.
Question 5
A 58-year-old female patient taking alendronate (Fosamax) for osteoporosis
for five years presents with a non-healing extraction socket and exposed
bone. What is the most appropriate initial step in managing this patient before
any dental hygiene procedure?
A) Proceed with routine prophylaxis using ultrasonic scaling only
B) Prescribe a 7-day course of amoxicillin
C) Discontinue the alendronate immediately and refer for debridement
HESI Dental Hygiene EXAM with COMPLETE
QUESTIONS AND DETAILED SOLUTIONS /LATEST
UPDATE THIS YEAR/ JUST RELEASED/2026
Examination Coverage
• Periodontics (classification, etiology, treatment) •
• Oral Pathology & Oral Medicine
• Medical History & Systemic Disease Management
• Pharmacology & Local Anesthesia
• Dental Radiography & Image Interpretation
• Instrumentation & Clinical Techniques
• Patient Education & Preventive Care
• Infection Control & Medical Emergencies
• Dental Anatomy, Occlusion & Tooth Morphology
• Ethics, Legal & Professional Responsibility
• Nutrition, Caries Risk & Fluoride
, Page 2 of 80
Question 1
A 45-year-old patient presents with generalized attachment loss of 4-6 mm,
bleeding on probing, and radiographic bone loss affecting less than 30% of
sites. The patient is a non-smoker with no systemic conditions. According to
the AAP/EFP classification, which periodontal diagnosis is most appropriate?
A) Periodontitis Stage I Grade A
B) Periodontitis Stage II Grade B
C) Periodontitis Stage III Grade C
D) Necrotizing periodontal disease
CORRECT ANSWER: B) Periodontitis Stage II Grade B ✔
Rationale: Stage II periodontitis involves moderate attachment loss (3-4 mm
CAL) and bone loss in less than 30% of sites. Grade B indicates moderate
progression rate consistent with a non-smoker without diabetes.
Question 2
During subgingival scaling on a mandibular second molar, you encounter a
deep, narrow pocket on the distal surface that feels rougher than the
surrounding root. The patient reports occasional dull pain in that area. What
anatomical variation is most likely causing this clinical finding?
A) Enamel pearl
B) Cervical enamel projection extending into the furcation
C) Palatogingival groove
, Page 3 of 80
D) Dilaceration of the root
CORRECT ANSWER: C) Palatogingival groove ✔
Rationale: A palatogingival groove is a developmental anomaly that occurs
most often on maxillary incisors, but similar distal grooves on mandibular
molars can trap plaque and cause localized periodontitis with a rough tactile
sensation.
Question 3
A dental hygiene student is calculating the ideal water flow rate for an
ultrasonic scaler to achieve maximum cavitation without causing thermal
damage to the pulp. Based on current research, which flow rate range
provides the optimal balance between cooling and biofilm disruption?
A) 2–5 mL/min
B) 10–15 mL/min
C) 20–45 mL/min
D) 50–75 mL/min
CORRECT ANSWER: C) 20–45 mL/min ✔
Rationale: Studies indicate that a water flow rate of 20–45 mL/min produces
effective cavitation and acoustic streaming while preventing overheating of
the tooth, soft tissue, and pulp.
Question 4
A patient with a history of mitral valve prolapse with regurgitation requires
periodontal debridement. According to the 2021 AHA guidelines, which
, Page 4 of 80
prophylactic regimen is indicated if the patient reports a severe allergy to
amoxicillin?
A) No prophylaxis is required for mitral valve prolapse
B) Clindamycin 600 mg orally 1 hour before the procedure
C) Azithromycin 500 mg orally 1 hour before the procedure
D) Cephalexin 2 g orally 30 minutes before the procedure
CORRECT ANSWER: A) No prophylaxis is required for mitral valve
prolapse ✔
Rationale: The 2021 AHA guidelines no longer recommend antibiotic
prophylaxis for mitral valve prolapse unless the patient has a prosthetic valve,
prior infective endocarditis, certain congenital heart diseases, or cardiac
transplant with valvulopathy.
Question 5
A 58-year-old female patient taking alendronate (Fosamax) for osteoporosis
for five years presents with a non-healing extraction socket and exposed
bone. What is the most appropriate initial step in managing this patient before
any dental hygiene procedure?
A) Proceed with routine prophylaxis using ultrasonic scaling only
B) Prescribe a 7-day course of amoxicillin
C) Discontinue the alendronate immediately and refer for debridement
