In April 1997, the U.S. Food and Drug Administration ruled that toothpaste manufacturers weren’t adhering closely enough to voluntary safety guidelines. As a result, all toothpaste tubes now bear a scary-sounding warning. It was like this one: “Keep out of the reach of children under 6 years of age. If more than used for brushing is accidentally swallowed, get medical help or contact a poison control center right away.” In the months following the new warning, toothpaste consumer lines fielded hundreds of questions from worried parents, and poison control centers were flooded with calls as well. They told parents the same thing: your child is fine and may vomit, or not. The only reason to see a doctor, however, is if the vomiting gets so serious that dehydration becomes an issue. That’s right: you can eat your fill of delicious toothpaste and not come away with anything more serious than nausea and diarrhea.
If more than used for brushing
How should I get this? I think it should be like "If more than is used for brushing", don't you? How do I have to grasp "than" in syntax aspect? It's conjuction?