Study Links End of Water Fluoridation in Israel to Rise in Cavity Treatments

A recent Israeli study has indicated a connection between the cessation of water fluoridation in Israel and an increase in cavity treatments among children, particularly exacerbating disparities between socioeconomically advantaged and disadvantaged populations. The research, published in the Israel Journal of Health Policy Research, analyzed dental records of 12-year-olds treated by Maccabi Dent between 2014 and 2022.

The most striking finding pertained to children from low socioeconomic areas. In communities without fluoridated water, the rate of cavity treatments was more than double that of children from high-ranking areas. Within the low-income group, the treatment rate was approximately 24% higher in areas without fluoridation compared to those with it. This figure represents a difference in treatment rates, not necessarily a 24% increase in the number of children developing cavities.

Over 61,000 restorative treatments, including fillings and crowns, and 3,327 permanent tooth extractions due to cavities were recorded during the study period. Nearly 28,000 children received at least one restorative treatment, and 1,545 required extractions. The study focused on the MF index, which measures restored and missing teeth due to cavities, based on treatment records.

Researchers divided children into three groups based on their residential area's socioeconomic ranking: low, medium, and high. The absence of fluoridation showed a statistically significant impact on children from low-ranking areas, with average MF index scores of 0.817 compared to 0.623 in medium and 0.395 in high-ranking areas. While disparities persisted even with fluoridation, the gap between children from weak and strong socioeconomic backgrounds was smaller in fluoridated areas.

The study's authors suggest that fluoridation offers protection independent of family income or proactive dental care, as more affluent families may compensate for its absence. They also noted a 25% higher average MF index among girls (0.54) compared to boys (0.43), possibly due to earlier permanent tooth eruption and differing dental service utilization. The researchers recommend reinstating water fluoridation, prioritizing disadvantaged areas, and implementing targeted government funding. They also advise expanding preventive measures like school fluoride varnish applications and oral health education, along with a national monitoring program.

While the study provides strong observational evidence, it does not definitively prove causation or rule out other contributing factors. Limitations include the lack of data on untreated cavities and individual fluoride exposure.