Which teeth have the most susceptible pit and fissures?

• A. Permanent molars
• B. Primary incisors
• C. Canines
• D. Premolars

Answer: (A)

Pits and fissures tend to harbor caries because their deep, irregular grooves trap plaque and are hard to clean. The most susceptible teeth are the permanent molars, especially the first molars, because their occlusal surfaces have numerous deep, complex grooves that create many niches for bacteria and food debris. These features, combined with eruption around age six and early exposure before routine sealant protection, make molars the highest risk for pit-and-fissure caries. In comparison, the smoother surfaces of incisors and canines have fewer deep grooves, and premolars have fewer or less pronounced fissures than molars, so their risk is lower. Sealants are particularly effective preventive measures for these high-risk molars.