Razors are sharp because they are generally used in a pressure cutting action rather than slicing. They are usually made of stainless steel, sharpened to a razor-sharp edge, and coated with even harder materials, such as diamond-like carbon. However, knives require regular sharpening, while razors are routinely replaced after cutting much softer materials than the knives themselves. To keep razor blades sharp and extend their life, it is important to clean them regularly with isopropyl alcohol and use a strap to realign the thin edges of the blade.
Additionally, it is important to store them in a dry place and replace them when they start pulling hairs instead of cutting them cleanly. If these steps do not help, it is possible to sharpen the razor blade's edge with a knife bank or other razor blade sharpeners. Knowing how to keep safety razor blades sharp and how to sharpen safety razors can make a big difference in your wet shaving operation.