The degree of saturation of the beverages with respect to hydroxyapatite is very important when considering their erosive potential. It has been demonstrated that the presence of a degree of saturation with respect to hydroxyapatite of 0.032, which can be achieved by adding 7.4 mM of Ca and 0.6 mM of phosphate to a solution of 10.1 mM citric (pH 3.6), can reduce the time of softening of enamel in the solution by about 50%3.