Background: Dental caries is one of the most prevalent infectious diseases of man. Fluoride is the most effective measure for the primary prevention of dental caries if taken in optimal amounts. The optimal level of fluoride in drinking water supply is 0.7 to 1.2 ppm.
Objective: The study aimed to determine the effect of water purification on the fluoride content bottled water.
Methods: This was descriptive cross-sectional study conducted in Iloilo City. All (12) purifying stations that used well water and 7 randomly selected purifying stations from among the 34 that used in Metro Iloilo Water District (MIWD) water were include in the study. Two hundred ml of raw and product water were collected in plastic bottles from 19 purifying stations. Fluoride level in samples obtained before and after purifying was determined at the Research and Analytical Service Laboratory of the University of the Philippines-Natural Science Institute using the metrohn electrometric ion selective electrode.
Results: The mean fluoride level in MIWD water was 0.152 ppm while the mean fluoride level in well water was 0.159 ppm (> 88.83% reduction) in well water and > 0.132 ppm (>86.84 reduction) in MIWD water.
Conclusions: Water purification reduces the fluoride content of purified bottled water to <0.02 ppm. The flouride content of well water, MIWD water, and bottled water purified in Iloilo City are below the optimal level of 0.7-1.2 ppm.