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Fluoride exposure and hypothyroidism in a Canadian pregnancy cohort.

1. Introduction Fluoride is added to some public water supplies and dental products to prevent dental caries (Community Water Fluoridation, 2019). Drinking water is the largest source of fluoride for children and adults living in fluoridated communities, accounting for 40 %–70 % of daily intake (United States Environmental Protection Agency, n.d.). Black tea is another dietary source of fluoride (Krishnankutty et al., 2021). Questions about systemic fluoride exposure during pregnancy h