Ok I went and got my teeth whitened by Zoom. I made it through all 4 stages with no incedent. I did have zinger right after, I got done at 4pm and its 7pm now. zingers have calmed down after about 3 hours. They will be there.
Im glad I made it through all 4 levels. It was worth it. My teeth are bright white. If you can afford it and want beautiful teeth do it! Remember you will feel pain.