No, ice cubes do not actually sharpen garbage disposal blades, because standard garbage disposals do not have sharp cutting blades. Unlike a blender or lawnmower, residential garbage disposals rely on blunt metal impellers (lugs) mounted on a spinning flywheel that pulverize food waste against a stationary jagged shredder ring through sheer kinetic force. However, tossing ice cubes into the disposal is still beneficial because the hard ice chunks scour away sticky grease, food sludge, and bacterial slime clinging to the internal grinding chamber walls and impellers, keeping the unit clean and fresh. Verification: Inspect the grinding chamber after running ice to confirm that residue is removed and the unit runs smoothly.
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