What it does
"Crushing Teeth" isn't a standard Magic keyword or ability—it doesn't appear in the comprehensive rules or on any official card I can verify. You may be thinking of a similarly named card, ability, or perhaps a homebrew/custom mechanic.
There are cards with "teeth" in their names (like Skophos Maze-Warden effects or various dinosaur/beast cards), and mechanics like Enrage or Trample that fit aggressive creatures, but nothing called "Crushing Teeth" specifically.
If you can tell me the exact card name or where you encountered this, I can give you an accurate breakdown of how it works and its Commander applications. I'd rather not invent rules text that could lead you astray during a game—getting interactions wrong on something like trample, fight, or damage assignment can swing a match.
Iconic cards with Crushing Teeth
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