This is somehow worse than your synopsis makes it out to be. The same standard was selectively applied to this person when compared to another dental hygienist

This is somehow worse than your synopsis makes it out to be. The same standard was selectively applied to this person when compared to another dental hygienist that did the same thing. And apparently somehow it is not against the rules when dentists do it, but it is when dental hygienists do it. Sounds like a case of regulatory capture, really.