Keeping a sharp edge on your blade is important for your own safety. Compensating for a dull edge by applying additional force to finish a cut is where serious injuries can occur. If the knife blade is unexpectedly freed from what you are cutting, there is often an ongoing momentum that can slash you. Sharpening by hand can be a tricky task, however, as most do not have the finesse to maintain the proper sharpening angle to produce a razor sharp edge. Over the last few years, though, some manufacturers have developed solutions that can produce knife blades sharp enough for surgery.