Long story short:
Is there a maximum number of teeth brushing per day without having fluoride poisoning?

Full story:
It is certain that a high fluoride intake leads to health problems. This is related to ingestion only (that is swallowing toothpaste, drinking high-fluoride water, eating rich-fluoride food) of this element.

While, when we talk about fluoride in toothpastes, we have a completely different assumption and absorption mechanism.
Thus, I assume, there will be different AI (adequate intake) and UL (upper intake level) than for fluoride food assumption[a].

my assumption is sustained by the fact that most commercial toothpastes[b][c][d] have less than 1500 ppm of F in them

Ultimately, does exist a daily upper safety level for fluorine absorbed from the toothpaste?

  • 1
    I don't understand your questions. Can you clarify and narrow it down to one question? – Carey Gregory Sep 19 '18 at 22:13
  • 3
    Where did you find the text quoted by you in your question where it says that toothpastes have exactly 1450ppm F in them? Is this the "dangerous assumption" you referred to? This part of your question is very unclear. – Chris Rogers Sep 20 '18 at 6:24
  • 2
    Neither of the two references you give for the fluoride concentration support your claim. The article's abstract mentions "standard toothpaste" as having 1450 (that doesn't mean all or most will have exactly 1450, only that that is a standard concentration for where the authors live) and the Wikipedia page you linked to claims that 1450ppm is the upper limit of the concentration in most toothpastes. Could you edit and clarify what you are asking? – terdon Sep 20 '18 at 17:02
  • 1
    There's no evidence that fluoride is absorbed in the mouth, so unless you're swallowing toothpaste instead of spitting it out, the ingestion levels are trivial compared to other sources. – Carey Gregory Sep 21 '18 at 1:32

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