Fig. 3

SEM images of a representative specimen in the different toothpaste groups after demineralization of 8 h and remineralization (brushing with the appropriate toothpastes). Grey areas represent the intact enamel (enamel prism) and the black areas the defective enamel (corresponding to demineralization by the lactic acid). (a = control group without treatment; b = Karex; c = Elmex; d = Ajona)