I did this procedure Exactly one year ago. Everything went ok. After the treatment your teeths are very sensitive (sometimes hard to tolerate) but it comes with the package. It works great. I saw a difference instantly after the treatment. I decide to do it because I wanted to have a whiter smile. If you're thinking on getting this done you must know that it will make your teeth very sensitive after treatment, other than that it's really worth it and everybody will notice the difference. I'm happy with the results. I have no complains other than the sensitivity but to me that's ok.