In relation to the Certainly Lethal Dose (CLD) of fluoride, how does the Safely Tolerated Dose (STD) of fluoride compare?

Question

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In relation to the Certainly Lethal Dose (CLD) of fluoride, the Safely Tolerated Dose (STD) is 1/4 of the CLD.
The typical amount of fluoride an individual could inadvertently ingest but safely tolerate is only a quarter of the amount which could cause death. If four times the Safely Tolerated Dose is consumed, emergency action should be taken.

In Relation to the Certainly Lethal Dose (CLD) of Fluoride