Just drag the knife through a couple times. Also the two carbide inserts can be rotated to give the tool new life.
My wife would ruin our knives with that. She couldn't hold a knife vertical if her life depended on it. Our bread, cheese, and tomatoes always looks like the leaning tower of pizza. The kids and I laugh about it. No idea how to fix that. Can't hang pictures straight either. Good thing walls have corners! Otherwise the paint and wallpaper would all be on angles too!