Like magic!
I have whitened my teeth frequently over the years with only mild to moderate tooth sensitivity. I bought the doctor song re-mineralization gel along with a separate 40% peroxide solution (not Dr. song). My teeth were fairly sensitive from the whitening, but, followed with the remineralization gel, I had minimal sensitivity and my teeth didn't feel brittle or gritty. I'm a scientist, cosmetics skeptic and general realist- this remineralization gel exceeded expectations.
Rating: 5 stars