Exposure to water fluoridation and caries increment.

Area of Science:

• Public Health
• Dental Research
• Epidemiology

Background:

• Dental caries remains a significant public health concern globally.
• Water fluoridation is a widely implemented public health measure for caries prevention.
• Understanding the association between water fluoridation and caries increment is crucial for optimizing oral health strategies.

Purpose of the Study:

• To investigate the relationship between exposure to water fluoridation and the increase in dental caries among children in Queensland and South Australia.
• To compare the impact of varying fluoridation coverage levels on caries increment in different Australian states.

Main Methods:

• A cohort study design was employed, involving stratified random sampling of children from fluoridated and non-fluoridated areas in South Australia and Queensland.
• Baseline data on lifetime exposure to fluoridated water, other fluoride use, and socioeconomic status were collected via questionnaires.
• Dental examinations assessed tooth surface caries status, with follow-up data collected over three years for Net Caries Increment (NCI) analysis.

Main Results:

• Increased lifetime exposure to fluoridated water was a significant predictor of lower annualised Net Caries Increment (NCI) in the deciduous dentition for both states.
• A similar association was observed for the permanent dentition, but only in Queensland.
• These findings remained significant after controlling for age, gender, other fluoride exposures, and socioeconomic status in multiple linear regression analyses.

Conclusions:

• Water fluoridation demonstrates effectiveness in reducing caries increment, even when other fluoride sources are present.
• The caries-preventive effect of fluoridated water was most pronounced in the deciduous dentition.
• The impact of water fluoridation was stronger in areas with less diffusion of food and beverages from fluoridated to non-fluoridated regions.