Tooth most affected by gingivitis

 # Facial surface of which tooth is most affected by gingivitis?
 A. Upper first molar
 B. Lower first molar
 C. Lower central incisor
 D. Lower premolar

The correct answer is A. Upper first molar.

Facial surface of upper first molar and lingual surface of lower central incisors is most affected by gingivitis. This is due to close proximity to opening of salivary ducts.

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