Caries Susceptibility by Surface — NDEB AFK MCQ
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Correct answer: C — Occlusal pit and fissure surfaces of posterior teeth
Occlusal pit and fissure surfaces are the most caries-susceptible tooth surfaces because their complex morphology (deep, narrow, often retentive fissures) traps bacteria and food debris in an environment that is inaccessible to brushing, salivary clearance, and fluoride delivery. Approximately 80-90% of caries in permanent posterior teeth occurs in the pit and fissure system. This is why pit and fissure sealants are the most effective targeted caries prevention strategy for newly erupted molars and premolars.
Reference: Fejerskov & Kidd – Dental Caries: The Disease and Its Clinical Management, 3rd ed., 2015