Teeth Whitening

I was recently given a free sample of Crest 3D Whitestrips. I was never really worried about the color of my teeth; I was more concerned with how crooked they were. However, I gave these a try and I was surprised. I was supposed to use them for 20 days, but I found that my teeth had become very sensitive after 5 days. At that point I stopped the treatment. After only 5 days I was surprised to find that my teeth were noticeably whiter. However, having whiter teeth was not a huge concern of mine and the sensitivity had become a constant annoyance. If you're desperate to have whiter teeth this might be a good idea. It worked well and was pretty easy. All I had to do was wear the strips for half an hour everyday. But, as I mentioned, the amount of pain I experienced after just five days was disconcerting.