What is a major drawback of using coarse grit abrasives?

Using coarse grit abrasives is primarily associated with leaving the surface rough after polishing. This happens because coarse grit is designed to remove material quickly and aggressively, which can lead to an uneven finish. While it is effective for removing significant discoloration or surface irregularities, the downside is that the texture created may not be smooth enough for a polished appearance, making it less ideal for final polishing stages.

In contrast, finer grits are typically used to smooth the surface after coarse grit has done its job, providing a polished finish with a shine. The other options—such as the inability to remove stains, exclusive use on dentin, or excessive shine—do not accurately reflect the significant characteristic of coarse grit abrasives and their inherent drawbacks. Hence, the implication that coarse grit leaves the surface rough is a valid concern in the context of using abrasives for polishing.