External control of fluoridation in the public water supplie
Among the methods currently available to provide fluoride in population levels, fluoridated water is the most successful for presenting high efficacy, safety, and good cost-benefit.

This study aimed to perform a systematic review of the literature to assess the adequacy of fluoride concentration in the water in Brazilian cities using external control.

Six databases were used as primary search sources and three databases were used to partially capture the "gray literature". Only observational studies that assessed the fluoride concentration of artificially fluoridated water from the public supply network were included.

The search provided 2038 results, from which 14 met the eligibility criteria and were included in the data extraction of the review. Overall, the water samples were collected from 449 different sources in three Brazilian regions. Thirteen studies presented a low risk of bias. The mean concentration of fluoride ranged from 0.17 to 0.89 ppmF.

The meta-analysis demonstrated that more than half of the water samples analyzed had fluoride concentration levels outside the acceptable range, with high heterogeneity.

More than half of the public water supply analyzed in the studies selected had fluoride concentration levels outside the acceptable range, which may affect the risk of developing oral diseases in the Brazilian population, having an important impact on public health.

BMC Oral Health
Source: https://doi.org/10.1186/s12903-021-01764-0
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