Donnie has this gap on his teeth because he was trying to build something out of Splinter's old stuff with a hammer when he was still a noob. He smashes the hammer at a rubber cork with a nail stuck on it, then it bounced back at his teeth, and the poor boi never had a complete set of teeth ever again..
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TMNT headcannons.
RandomIN HONOR OF THE TMNT 2012 SERIES! I HEREBY PUBLISH THE HEAD CANNONS!!! *confetti pops* yeah!