Suppose I have a very small cavity, and I go to the dentist, and he digs and drills, and make a small hole into a much bigger one, and then caps it with filling ...

Or alternately, I diligently brush my teeth immediately after EVERY single meal. Every time I eat anything. And I keep this up for 3 months. And the micro cavity dissapears.

Question, with very very small cavities, do teeth have some limited capability to heal?