I had my Zoom treatment done right after my regular routine cleaning. This probably can produce the best results. My results were excellent. I did have some zingers but probably not nearly as bad as most others. Here's what I did. Several weeks before treatment, use a toothpaste designed for sensitivity. I used Sensodine ProNamel and it really worked for me. It's already been 3 hours since my whitening and the little pain I did have is gone for the most part. I've also heard of some using a flouride mouth rinse in addition to the sensodine. Save yourself the pain of zoom and prepare yourself before hand.