What can using a dull blade lead to during shaving?

Using a dull blade during shaving can lead to razor burn primarily because a dull blade does not provide a clean cut, which forces the user to make multiple passes over the same area. This repeated friction can irritate the skin, causing redness, discomfort, and inflammation often associated with razor burn.

In contrast, a sharp blade glides over the skin more smoothly and requires fewer passes, reducing the chances of irritation and resulting in a more comfortable shaving experience. Dull blades can also tug at the hair rather than cutting it cleanly, leading to uneven hair removal and further increasing the risk of skin irritation. Therefore, it is crucial to use a sharp blade to ensure a comfortable and effective shave, minimizing the risk of razor burn.