@urtoast But not for surgical use. And thus not sterilized before use. Besides, I wouldn't want a knife to start sucking my blood either. Stab me, sure, but don't suck.
@Toriichii Well, 'clean' and 'sterile' are not the same.
Besides, we've seen them eat. Meaning they have bacteria in their mouths. We've not seen any brushing of teeth, or the blade equivalent which I guess is dismantling to clean between blade/handle/pommel or something? Whenever he cleans the blades, it's visualized as him 'cleaning' their bodies.