Dame, supposedly lack of grains.
But I know nothing about this site that I linked to. It was just something I stumbled across. I do know that a lot of my friends who I believe have managed to heal cavities. Not as quickly and easily as in this story, but they are also not the average population. They are people with serious health issues to begin with, that led them to seek info about alternative health care. So it wouldn't seem illogical that they have to work harder to get into balance and heal.
I myself healed a cavity. I wasn't trying to. I wasn't watching it. I have no idea how long it took. All I know is that I had the cavity filled when I was 13. The cavity was present at dental visits at least until I was 21. Then I didn't go to the dentist for 5 years. During that time, the filling must have fallen out, and the cavity is now healed. There is no sign that it was ever there. There is nothing there but tooth.