A prolonged absence of water fluoridation in Saint John, New Brunswick, spanning over a decade, is coinciding with a marked increase in tooth decay cases among children and young people. Dental professionals are reporting a surge in cavities and other dental health issues, mirroring concerns previously voiced regarding the cessation of fluoridation. The lack of fluoride in the water supply is believed to be a significant contributing factor to the deteriorating dental health observed in the region’s youth. Experts had previously warned that discontinuing fluoridation would likely lead to such outcomes, and current trends appear to validate those predictions. This situation highlights the ongoing debate surrounding the benefits of water fluoridation as a public health measure. The dental community is now advocating for the reinstatement of fluoridation to address the growing problem and prevent further deterioration of oral health.