I replace my blades after every animal I harvest or attempt to harvest (aka miss). I want to make sure I am making a clean harvest on the animal. If you use a potential dull broadhead you are taking the risk of having less penetration and also the broadhead will tear the hide and lungs more instead of a clean slice which can cause a bad or good blood trail. Decide sharp or dull? . Another example when you clean your animal do you use a sharp knife or a dull? I use a sharp knife. We as hunters owe it to the animal to take the animal as fast as possible with the cleanest and ethical way. We are taking their life and there is where we should respect that by make sure our equipment is squared away, we are squared away (shooting etc) and we wait for the right shot. I think a lot of hunters tend to not look at it like that and compromise on so much stuff. Don't compromise on something you put so much time and money in to.