(Continued)
The ionic speciation study conducted in 2006 mentioned previously (Finney WF, Wilson E, Callender A, Morris MD, Beck LW. Re-examination of 
hexafluorosilicate hydrolysis by fluoride NMR and pH measurement. Environ Sci Technol 2006;40:8:2572) 
 The pharmacokinetics of ingested fluoride was studied by a 2008 study (G.M. Whitford, F.C. Sampaio, C.S. Pinto, A.G. Maria, V.E.S. Cardoso, M.A.R. Buzalaf, Pharmacokinetics of ingested fluoride: Lack of effect of chemical compound, Archives of Oral Biology, 53 (2008) 1037–1041). 
In other words: "fluoride ion is a fluoride ion is a fluoride ion".