The sad irony here is that the FDA, which does not regulate fluoride in drinking water, does regulate toothpaste and on the back of a tube of fluoridated toothpaste … it must state that “if your child swallows more than the recommended amount, contact a poison control center.” The amount that they’re talking about, the recommended amount, which is a pea-sized amount, is equivalent to one glass of water. The FDA is not putting a label on the tap saying don’t drink more than one glass of water. If you do, contact a poison center… There is no question that fluoride — not an excessive amount — can cause serious harm.