Queen Astilon
A late response but I've only just found this site! I haven't exactly had a tooth heal with no treatment at all, but my story might be helpful to you.
Twenty years ago a dentist did some bridgework on me and, because one of the supporting teeth was weak, he decided to add extra support at the other end of the bridge. To do this, he added an arm from the top of the bridge at the strong end (from the strong, healthy tooth he crowned to support the bridge) ending in an inlay into the tooth next to that - another healthy tooth. This last bit is what caused the problem. I told him I could feel it pulling on this extra, inlaid tooth whenever I bit into anything (the bridge is on the front teeth) but he insisted this was my imagination.
A few years later, the pain in this inlaid tooth was unbearable and he had to admit that the inlay was leaking and there was a hairline crack in the enamel. He cut the connection with the bridge, removed the inlay and drilled out the decay, which he said was extensive. He put in a 'dressing' (temporary filling) and made an appointment for four months later to do a
root canal treatment (kill the tooth) and a crown. He also pointed to several teeth, saying "I can see demineralisation here, here and here; that often starts at your age." I was 40.
However, I had just begun taking a colloidal mineral supplement at that time, and had also switched to safe toothpaste, free of fluoride and sodium laurel sulphate. There are all kinds of these available; the one I used also claimed to help 'remineralise' (whatever that meant). When I turned up four months later, my dentist drilled out the temporary filling and pronounced that the tooth was okay now, and didn't need the
root canal job doing!! Yipppeeeee!! Also, the hairline crack had healed and when I asked about the demineralisation he said "There is no sign of that anywhere."
I hope this helps in some way. The tooth in question is still alive and well 6 years later.