Comment by ryao
19 days ago
Fluoride in Toothpaste: Do not ingest.
Flouride in Water: Ingest away.
I do not understand how these two can co-exist.
19 days ago
Fluoride in Toothpaste: Do not ingest.
Flouride in Water: Ingest away.
I do not understand how these two can co-exist.
Radioactive isotopes in nuclear fuel: do not ingest.
Radioactive isotopes in banana: consume away.
Understand now? I'm not even defending anything other than how two things that vaguely appear contradictory, are in fact, not.
I don’t.
Because your banana example doesn’t have additives meant to be reactive — so is unlike adding fluoride to water at levels which impact dental health.
It's the concentration that matters. Toothpaste has over 1000x the concentration of fluoride vs 0.7mg/L as tap water. Many well water sources have naturally occurring fluoride that exceeds the additive levels.
6 replies →
Maybe another example will help?
Chlorine for water treatment in the backcountry when applied to a liter of water: Ingest.
Chlorine straight from a household bleach bottle: Do not ingest.
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Fluorine is a dietary mineral.
At higher dosages, every dietary mineral becomes harmful, then (generally) lethal.
Without iron, humans die. Yet accidental (over-)ingestion of iron supplements is a leading cause of poisoning in small children.
Concentrations.