I am an avid drinker of everything that makes my teeth yellow -- soda, tea, coffee, etc. This addiction, unfortunately, causes my teeth to look like that of a 80 year old smoker. After trying over-the-counter medications that worked only briefly, I went to Cosmetic Dental Center of Chicago for teeth whitening. I was surprised by the results! I am really happy and will go back to them again as soon as my teeth start becoming yellow.