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Tooth erections
(lemmy.world)
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If it's one to one how we get erect normally, and as the human body essentially inflates using blood, your teeth would ultimately be blood sponges. Seems impractical.
Of course, take it a step farther and maybe physiologically the blood hardens to a sharp point. I know some fantasy settings where bloodstone is a thing, so I guess that. If it was possible, it'd look sick as fuck.
Or maybe our teeth retract using that as a mechanism?