of cinnamon on ants. My middle daughter told me this morning that there were ants in the sink of their bathroom (after the little bits of toothpaste in the sink), so I grabbed my industrial size cinnamon container. and went and sprinkled their sink with it, closed the door and left it for a couple hours. Went back in, wiped up the cinnamon, with not an ant in sight. So easy, and 100% safe for kids and pets.