Master of Potions, Inuyasha and others in “Unfinished Business”

Just so we're clear: the monk's body hasn't recovered. You understand that, right? He merely can't feel the pain from his wounds anymore. The damage from the miasma remains.

Inuyasha

I know... and I'm grateful even for that.

Sango

Master of Potions! You've helped restore Hiraikotsu to the way it was. I can't thank you enough.

"The way it was?" You forget that your Hiraikotsu has been swimming around in my herbs and poisons! It will never be "the way it was" as you say.

Sango

Huh?

However, it won't be evident to you until you fight again. When you do, don't be surprised by how it may have changed.