My experience was somewhat uncomfortable. The results was not exactly what I was hoping for. I was told in the beginning after reviewing with the dentist was that the shade would only go 2 shades whiter. Since that was the case, she decided to put me through instead of a three "20 minute" procedure, we did it four times. At first, I thought everything was okay, then an hour or so later, my teeth were so sensitive, I took tylenol and a nap for the rest of the afternoon. But that was not the bad thing that got me upset, when I woke up from my nap, my bottom lip swelled up so big that it looked deformed. I also had a blister on the inside of my bottom lip. After contacting my dentist, all she told me was I was told in the beginning that this may happen and I could just go to a drug store to buy an over the counter medication for canker or cold sores. She also said there is nothing they can do. So I just want to tell my story of what happened to me with Brite Smile.