Answer:
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
I get wet when drying. I get dirty when wiping.
Die without me, never thank me. Walk right through me, never feel me. What am I?
I am the minerals vital for your good health.
I have memories, but none of my own. Whatever's on my inside is what is shown. If I'm ever different, it's because you changed me. I feel like a decoration, here for you to arrange me. What am I?
A doctor might remove one from the neck of a Dracula victim.