This was my first experience with Crest Whitestrips. I wanted to start off easy with the 5 minute ones and this one had decent reviews and claimed no pain. My teeth are somewhat sensitive. I use the Sensodyne Pronamel toothpaste. While my teeth are not super yellow, they do get stained easily because I drink tea. Rarely coffee and I don't smoke. The teeth staining issue was something I've always remember having even before I…