High speeds during polishing should generally be avoided because:

High speeds during polishing should generally be avoided because they can lead to increased sensitivity in the teeth. When polishing at high speeds, the heat generated can damage the tooth surface and surrounding tissues, potentially leading to pulp irritation or discomfort. This sensitivity occurs due to the thermal and mechanical effects on the enamel and dentin, which can expose the nerves within the tooth.

In addition, while the other choices may touch on related aspects of polishing, they do not encompass the primary concern of patient comfort and well-being. High speeds may not be as effective for certain tasks, but they can gloss over stains and generally create a less desirable finish on the tooth surface, which could fail to achieve the intended polishing results. The focus should be on achieving a smooth, clean surface without compromising the patient's comfort.