Water fluoridation: current effectiveness and dental fluorosis

Area of Science:

• Public Health
• Dental Research
• Epidemiology

Background:

• Water fluoridation has been a cornerstone of dental caries prevention for decades.
• The widespread use of various fluoride products has altered the oral fluoride landscape.
• Understanding the current impact of water fluoridation requires re-evaluation in the context of multiple fluoride exposures.

Purpose of the Study:

• To review the evidence on water fluoridation's effectiveness under current conditions of multiple fluoride exposures.
• To assess the extent of dental fluorosis at different fluoride concentrations.
• To examine the "halo" effect of water fluoridation and its contribution to overall fluoride intake.

Main Methods:

• Literature review of studies examining water fluoridation's effectiveness.
• Analysis of dental caries and fluorosis prevalence data in relation to water fluoride levels.
• Evaluation of fluoride intake from various sources, including community water.

Main Results:

• The effectiveness of water fluoridation in reducing dental caries has decreased over time due to increased use of other fluoride sources.
• Differences in caries and fluorosis prevalence between fluoridated and non-fluoridated areas have narrowed significantly.
• The prevalence and severity of dental fluorosis have increased, with other fluoride sources now accounting for a larger proportion (60%) of cases compared to water fluoridation (40%).
• The "halo" effect may lead to increased fluoride intake in non-fluoridated communities.

Conclusions:

• Water fluoridation remains a fundamental, equitable, and cost-effective method for caries prevention.
• The significant contribution of other fluoride sources to dental fluorosis warrants closer examination and potential modifications.
• Future strategies should consider the cumulative impact of all fluoride exposures on dental health and fluorosis risk.