What happens to a tool when it is mushroomed at its head?

When a tool becomes mushroomed at its head, it means that the end of the tool, which is usually made of metal, has expanded due to repeated striking or impact. This deformation can compromise the tool's structural integrity, performance, and safety. A mushroomed tool is more likely to chip, break, or cause injury when used because the uneven surface can lead to unstable contact with the workpiece.

In many cases, a mushroomed tool is not safe to use, as the deformity can increase the risk of accidents and decrease effectiveness. Therefore, the best practice is to discard the tool. Continuing to use a mushroomed tool poses a risk not only to the person using it but also to those nearby, as flying debris can result from improper impact. Discarding a mushroomed tool ensures safety and prompt replacement with one that is reliable and effective for the intended job.