What are you oil pulling with? I found coconut oil helped me at times.
Then recently I had some good results with greens and tumeric, but even more recently.. I think bentonite clay has probably been the most helpful.. Time will tell.. Though.. I feel like it has made my teeth stronger than they've been in a long time and I've only been at it for maybe close to a week.. So.. You may want to look into some of those possibilities if your problems persist, I know oil pulling wasn't enough for my issues but it helped.. I think the clay might be the solution though..

Seems counter intuitive lol.. But.. I think it has to do with all the minerals in the clay and the clays ability to draw out toxins. Good luck with your teeth issues!