I also used Crest Pro Health. My teeth got incredibly stained - an ugly brown stain that the hygenist will need two intensive visits to remove. It became clear that the mouthwash was the only change I had made a few months ago and I will never use it again. I then started to research it on the web and discovered a large number of people who have had the same experience. Several people have contacted Crest, yet this product is still on the market. The Company should be paying for the cleanings.
We in my office have not experienced this problem so it would be difficult to respond to your concerns.