Range, Sphere
Your mouth contains a scroll, which you pull out and look at. On the scroll is a map, showing the range of the sphere of your mouth.
On the map, there is a circle drawn around your mouth showing what range your mouth exists in. Thankfully, your tongue and teeth are within that sphere.
けん
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Looking at the range of your mouth on the map, you notice a tiny samurai marked near your molars. It is Ken (けん) the samurai.
Everything else on the map was accurate, so you take a close look in the mirror, and there he is: a tiny Ken the samurai, protecting the range that is your mouth. He gives you a small nod and goes back to his post.