I did Zoom whitening two days ago. It was HORRIFIC. My dentist said absolutely NOTHING about the possibility of pain with this treatment. Everything was fine at first. The doctor took a picture of my teeth prior to starting. She painstakingly covered every part of soft tissue, leaving only my teeth exposed. She told me we were going to do three 15 minute treatments. The first one was fine. During the second one, my gums started burning slightly, and I began getting sharp shooting pains in my teeth. It was like someone was poking an exposed nerve in my tooth with a pin. I couldn't WAIT for the 15 minutes to be over. It got progressively worse through that session and when it was over I told the dentist that I would absolutely NOT do the third treatment. I really felt that it was doing SERIOUS DAMAGE to my teeth. When she removed all the stuff, she put vitamin E on my gums and Flouride on my teeth to "relieve the sensitivity" but that didn't work at all. She told me to rinse, and I was so terrified to put even a small amount of water near my teeth! I was VERY VERY upset and angry that she had not warned me, and I told her.
She took an "after" picture and showed me the before picture, and I told her I saw no difference at all- which was true (to be fair I only did 2/3 of the treatment). She started telling me about the at home part of the treatment and I told her I would absolutely NOT be putting anything related to Zoom near my teeth ever again. Thankfully, she did not charge me because if she did I would have had a fit (though I insisted on paying her for her time- not the treatment). I walked out of there very upset and in A LOT OF PAIN. Now it is 48 hours later and my gums are terribly sore (they feel burned) and my teeth are extremely sensitive and the sharp pains continue. I have never had sensitive teeth before, and I have a high pain tolerance. In addition, my sense of taste has been affected. Things still don't taste right! I really, really hope these negative side-effects go away soon. In my opinion, Zoom is VERY BAD for your teeth and could likely do lasting damage. I recommend you find an alternative to whitening your teeth, and stay far away from this procedure. It is a nightmare, and absolutely NOT worth it, especially when there are alternative treatments out there.
By the way... kudos to the dentist who took the time to research what patients who have experienced Zoom are saying on the internet, and decided on a different treatment for his patients based on the large number of people who said it was painful in reviews. All dentists should care so much! Too bad he is across the country because I would RUN to his office! He is a doctor who has his patients' best interests at heart.