RockChalkMom
It's all about the marketing. If you notice, even the genesis of the research covered in the journal article had to do with how companies were marketing their toothpastes. At the time, the
Iodine swabbing by the dentists would have been familiar to people. As that fell out of favor, it was probably on to "newer" and "better" toothpastes that could be marketed to people.