Town A and Town B are both located in Massachusetts. Both towns have approximately 100,000 residents and their own water supply. Fluoride is added to the water supply of Town A; nothing is added to the water supply of Town B. The decision to add fluoride to Town A's water, and not Town B's, was made using a random number table. Both towns are monitored and compared with regards to the occurrence of new cases of dental caries (cavities) over a five-year period. What type of study is this?

Question

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This is a Community Preventive Randomized Controlled Trial because entire communities (towns) are randomized to receive the intervention (fluoride) or not, and the study aims to prevent dental caries.

Town a and Town B Are Both Located in Massachusetts