Don, I had demineralization, white specks, which are pre-cavities, which started mainly on the tips and middle of the teeth, and then progressed from there to break, chip, wear down to the gum line, in a relatively short time. Now they're more near the gum line with no tooth left. I think enamel, acid erosion was a factor too, as well as chemo, radiation, illnesses, and my medicine regimens, that played in deterioration of my teeth, so was maybe multifactoral, and not just from radiation.