The most common indication that too much fluoride has been ingested is fluorosis of the teeth, which initially appears as a discoloration. More advanced cases will have brown and black stains, and the teeth become pitted. This damage is the result of demineralization of teeth during early childhood.
Some claim that fluoride makes tooth enamel stronger even thoughit is found to demineralizes teeth, resulting in fluorosis.
It is maybe advisable to wash all toothpastes off the teeth if fluoride containing products are used.
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