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If you're looking for a natural insecticide that doesn't contain chemicals, look no further than diatomaceous earth (DE). DE kills insects like ants, bed bugs, and cockroaches by entering their outer skeletons and dehydrating their bodies — it's not pleasant, but it works! To avoid inhaling any yourself, just use a small amount, and sprinkle it anywhere you suspect ants may be getting into your kitchen. It can be toxic, so follow the directions on the label.