Yes.... I have regrown one cavity, but I have 3 that I still need to heal and havn't seen much progress yet. It mostly has to do With the ph of your blood. When your blood is acidic, the body neutralizes this acid using calcium, and your bones and teeth have less calcium available to rebuild them.... And the bacteria on your teeth are able to create tooth decay whenever your ph is off... So if you clean out all the acid, by eating living foods for a long time, and make sure you get enough calcium, magnesium, vitamin a, d while eating a ton of greens, then you have a good chance to heal your enamel or even cavities if you get lucky!