Bite, Chew
Your mouth has a tooth that you use to bite and chew with.
Imagine that one tooth in your mouth chewing through everything. It's not easy to chew with only one tooth, but luckily yours is huge and razor-sharp, so it helps you to bite and chew your way through anything you like.
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か, かじ
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Your one tooth is so strong that you can even use it to bite and chew up a whole car (か).
Some people like eating cars, and you're one of them. You can't get enough of those delicious cars. You just bite them apart and chew.