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at the three different currents of 10, 15 and 20 nA. Zinc treated enamel proved itself to provide a more resistant barrier to proton attack than the fluoride treatment, even though the surface concentration and depth of penetration of fluoride in enamel was much more extensive than that of Zn2+. Fluoride showed itself to be an initial barrier to proton with rate constant similar to zinc, however this barrier only lasted for approximately one second for the range of quite high proton fluxes applied, before returning to a rate comparable to that of untreated enamel. This suggests that zinc substitution into the HA matrix creates a strong material, presumably zinc apatite, which is more resistive to proton attack than fluoride treated enamel. These experiments broaden the potential applications of CLSM in assessing the proton dispersion on surfaces and indeed for assessing the effectiveness of inhibitors on substrates.

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