There are several other studies related to this and there is one on mouthwash that I posted on the support forum. I don't know as yet how much the Miracle-Mineral-Supplement use for dental problems affect enamel hardness but saying it strips enamel or eats enamel is not justified from what I've seen. Also I've heard no one say that using Miracle-Mineral-Supplement in this way blackened their teeth or obviously damaged enamel. I don't know about other chlorine dioxide products. No one is using it as a whitener as far as I know which requires much longer contact. This story about it blackening teeth related to a treatment using chlorine dioxide and a strong dental acid as well as far as I remember. ?