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We safely transport, store and use such chemicals all the time, and many of them would be just as capable of killing you (if you drank them neat) as hexafluorosilicic acid (which is simply the concentrated liquid used as a convenient carrier for fluoride).
The fluoride used in tap water is hexafluorosilicic acid - toxic waste from phosphate fertiliser factories, which is not pharmaceutical grade, unlike that added to dental products.
Newcastle has an added ingredient called Hexafluorosilicic Acid, more commonly known to you and I as artificial fluoride.