Which type of tooth surface is least likely to be sealed due to its structure?

The structure of smooth tooth surfaces makes them less likely candidates for sealing compared to pits, fissures, and interproximal surfaces. Smooth surfaces have a relatively flat and even texture that does not typically harbor bacteria or food particles to the same extent as more complex surfaces, such as pits and fissures.

Pits and fissures are more prone to decay because they have occlusal grooves and deep indentations that can trap food particles, bacteria, and plaque, making them prime targets for sealants. Interproximal surfaces, which lie between teeth, can also accumulate plaque and require special attention, but the inherent structure of smooth surfaces does not warrant the need for sealing as these areas do not have the same risk for caries development. Consequently, the focus of dental sealants is predominantly on the more susceptible pits, fissures, and interproximal areas rather than smooth surfaces.