Questions and Answers
Did lifetime exposure to fluoridated water affect cognitive scores in older adults?
No. Testing nearly 2,500 older Irish adults across multiple exposure tiers showed that individuals with decades of high fluoride exposure performed identically on standardized cognitive tests (MMSE and MoCA) compared to those with low or no lifetime exposure.
How did this study differ from previous research on fluoride and brain health?
Most prior studies examined fluoride exposure across narrow, isolated timeframes (only childhood or short adult periods) or relied on broad regional assumptions. This study tracked full residential histories over several decades and matched them to historical municipal water monitoring archives, establishing individual lifetime exposure estimates.
Did early childhood exposure show any link to late-life cognitive decline?
The researchers found no evidence that childhood exposure harmed cognition later in life. However, because Ireland’s national program began in 1964, only 5% of participants were young children when the initiative launched, meaning larger future cohorts will be needed to confirm early-life outcomes.
Funding: The present analysis was funded by the Health Research Board (Ireland) Secondary Data Analysis Project Award. Data were used from Wave 3 of TILDA (2014–2015), which was funded by the Department of Health (Ireland) and Atlantic Philanthropies. The collection of historical address data and the estimation of lifetime fluoride exposure for TILDA participants was supported by a Health Research Board (Ireland) Applied Partnership Award. {read}