I want to get my teeth whitened. i am a smoker, and have noticed that despite my getting hygiene treatments, my teeth are starting to become discolored. I take care of my teeth, but well, they are still turning brownish from the tar. I did some research and have seen the whitening treatments. How do they work? Do you use a laser treatment? What is a laser treatment? Please help, I am very confused, and do not know who to go to for advice,