A snail's tooth
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As we all know, snails (as well as slugs) can quite easily chew up plants that are harder then they themselves are.
How do they do this? They have a hard and sharp "tooth" if you will (Probably really called a Radula) which they use to slice through whatever they are eating.
This western Washington common brownsnail has a chomper that matches his shell for color, but it's more flexible than his shell.