One day, out of the blue, my dentist asked me if I think that mouthwashes (like Listerine) can be linked to mouth cancer. Of course, i did not know. But I have never used mouthwash since. That was in 2002. And now, with my increased awareness of the impact of chemicals on the body, I feel pretty sure that to put something as strong as Listerine in your mouth every day (it burns, doesn't it), is not healthy. Just saying.