measurements (Table 1). For Coca-ColaTM, at CaGP concentrations of 5.0 and 10 mM, the pH increased to 4.37 and 5.29, respectively, which, in combination with higher calcium concentrations, led to no detectable wear in enamel blocks. The effect of calcium alone was also evident, since CaGP at 2 mM also was able to significantly reduce wear, for both soft drinks, despite only minor increases in the beverages pH. Nevertheless, for higher concentrations of CaGP, the protective effect against erosion was more pronounced for Coca-ColaTM when compared to Sprite ZeroTM. This might have been due to several factors. The increases in pH after supplementation were much less pronounced for Sprite ZeroTM. This might have been due to the presence of citric acid in this beverage, since it has been reported that citric acid (CitH3) is capable of forming chelating complexes with calcium leading to a drop of pH due to the release of H+(1).