Cariology and Prevention 1 Practice Test 2026 - Free Cariology Questions and Study Guide

The amount of disease present in the mouth is best captured by counting how many individual tooth surfaces are affected, not just whether a tooth is affected. Each tooth has multiple surfaces, so caries can involve several areas on a single tooth. This is why counting surfaces—DMFS, which tallies decayed, missing due to caries, and filled surfaces—provides a much more sensitive measure of the overall magnitude of caries in the dentition. It reflects both the extent and distribution of disease across the mouth.

In contrast, DMFT looks at affected teeth as a whole, so multiple lesions on one tooth may be missed, underestimating magnitude. Prevalence indicates how many people have any caries at all, but not how much disease there is per person or in total. Incidence tracks new cases over time, which tells about risk of developing caries, not the current burden. Therefore, DMFS best captures the magnitude of caries in the oral cavity.