Folding knife / Cutter knife

When you use a box cutter, if the top of a blade is too dull, you have to break the dull part then use it again.
When you break off the blade, it is a little bit annoying that you have to pull out the cap and break it every single time the blade is not in a well-conditioned, and it is also dangerous to remove the very part without any protection. I hereby suggest safer design that you do not need to break a part of blade.