This is fascinating…
These mothers are talking about curing cavities with nutrition — how eating the WAPF (Weston A Price Foundation — http://www.westonaprice.org) diet has actually remineralized their teeth. In other words, it can reverse and heal cavities.
One of the really interesting things you will see if you read the thread is that two of the moms whose children had really bad tooth decay at a very young age (under 3) were both vegetarians.
This makes sense — since you can't get vitamin D from plant foods. And calcium is what builds bone — but you can't absorb and use calcium unless you are getting enough vitamin D.
The other thing that is really interesting is that one of them cites a case where cavities were halted/prevented when the only thing that was changed in the diet was that raw milk was added (a case from a London orphanage).
I've always had a lot of cavities. I'll be interested to see how much better my teeth are by say a year or so — now that I'm eating this way.