In a community that has fluoridated municipal water, what is the minimal amount of water that an infant or toddler needs to consume to get enough fluoride for protection? I am concerned about this because many breastfed infants do not ingest a lot of tap water, but it is present in foods that are prepared at home. It is hard to gauge how much additional fluoride they may need

Both of your assertions—that breastfed infants may receive very limited amounts of fluoride and that it is difficult to quantify the amount of fluoride ingested from other food sources—are correct. The Food and Nutrition Board of the Institute of Medicine has established the “adequate intake” (AI) of fluoride to be 0.05 mg/kg per day. For a 10-kg child, the AI would be 0.5 mg/d. Where community water fluoridation is present at 1 ppm or 1 mg/L, drinking 500 mL or appoximately...

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