I'm a smoker and it was starting to show! I figured I would give these a shot in hopes for a prettier whiter smile! After using it only two times, I noticed my teeth noticeably whiter! I was also using the Crest Vivid White toothpase and the whitening...

These are pretty good but I find the 3D white strips stick to my teeth better and leave les mess behind. I also find that I don't have tooth pains with the new formula.