What is the primary benefit of using a pre-shave oil?

Using a pre-shave oil primarily serves the purpose of softening the beard before shaving. When applied, the oil penetrates the hair fibers, making them more pliable and easier to cut. This process reduces the resistance of the hair to the razor, allowing for a smoother and more comfortable shaving experience. By softening the beard, pre-shave oils contribute significantly to minimizing irritation and enhancing the effectiveness of the shave.

While other benefits such as preventing razor burn, adding fragrance, and hydrating the skin can also occur with proper use of pre-shave oil, the primary action is the softening of the beard which is essential for achieving an optimal shave. This is why the option highlighting the softening of the beard is the most accurate representation of the primary benefit.