Possible Clues:

• Sharp front tooth
• Enamelled cutter
• It cuts what one eats -- one is cutting corn, possibly
• Tusk, essentially
• Canine neighbor
• It starts in size, or, by the sound of it, in the jaw
• Something with cutting edge at front of trap
• Chisel-edged tooth
• Is coin, perhaps, right in exchange for a tooth?
• Denture part