I had Zoom teeth whitening and was very nervous going in as I have significant gum recession. I have heard it can be very painful for patients like me. To my sirprise, I had absolutely no pain and only brief minimal discomfort.
The hygienist was very meticulous with the prep. I credit her with my complete success.
However there are two facets to success at a dentist. Lack of pain and results of therapy. (ie, did the Zoom work?)
My teeth lightened 13 shades! They are significantly whiter. I couldn't be more pleased.