Review on Crest Gum Care Mouthwash, Cool Wintergreen, 16.9 fl oz. (Pack of 4): Promote Healthy Gums & Fresh Breath with Crest Gum Care Mouthwash by Jim Larson

Google it. It's one thing. Apparently Cross's official stance on mouthwash is that mouthwash turns the bacteria in your mouth brown, so that's fine, does that just mean you have a dirty mouth? Check it out on Youtube! I have always had a snow-white smile, no tooth decay, a very clean look. I started using this and after about a month I noticed my teeth were turning brown around the gum line. I asked the dentist and she asked if I use Crest mouthwash. I said I was! She informed me that some people had complained about it. I switched back to Colgatte which I used years ago and after about a month my teeth were back to normal. Apparently most people don't have this problem, but it's something to be aware of.