Is it better to use a substitute blade or sharpen a razor?

It's good to use a substitute blade instead of a straight knife. It is convenient and quick to use a straight knife instead of a blade, and it takes time to sharpen the knife. In comparison, it is better to replace the blade. Shavers are usually sharp, so it is enough to use a swinging cloth. Usually, a little polishing abrasive is coated on the swinging cloth, which can greatly improve the sharpness of the razor.