Our cafeteria uses only reusable food containers, utensils, and napkins, with kids separating their items as they return their trays after lunch. Used paper towels throughout the school are saved and reused for worm bedding. But if it breaks off close to the head or close to the tail, it won't die. Instead, it will grow another head or tail. However, the shorter broken piece won't grow into another whole worm.
Earthworms have no teeth.
Lizards, centipedes, frogs, toads, turtles, skunks, gophers, snakes, moles and birds all eat worms. People who spray insecticides on the earth are the biggest danger to earthworms. Poisons can kill many acres of worms at one time. There can be over a million earthworms in one acre of land. Their burrows are flooded and the water is no longer fresh.