Thanks for the useful ratings. No wonder the representative sounded nervous when I said I could not believe dentists did not have this product at their office. Boy, I do not think it will work for us if it does not keep plaque off the teeth. But I am fine with the acidophilus I am using now. I just thought the one made for the mouth would do more. Since the one I am using is made for intestines, I wonder if it was stronger at killing bacteria since the intestines have to deal with nastier bacteria than the mouth.