Which of the following studies is used to determine the natural progression of periodontal diseases?

Question

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A longitudinal study is used to track the progression of a disease over time in a group of individuals. In the case of periodontal diseases, a longitudinal study can provide insights into the natural course of the disease and factors that may affect its progression. Cross-sectional studies, on the other hand, provide a snapshot of a population at a specific point in time, while split-mouth and crossover studies are experimental designs used to compare different treatments or interventions.

Which of the Following Studies Is Used to Determine the Natural