What complication can arise from improper techniques used during coronal polishing?

Improper techniques used during coronal polishing can lead to soft tissue damage and dental plaque consolidation, making this option the best choice. When polishing, if excess pressure is applied or inappropriate instruments are used, it can cause abrasion and irritation to the soft tissues of the mouth, resulting in discomfort and potential injury.

Additionally, if the polishing is not done correctly, there might be areas where plaque is not completely removed, allowing it to consolidate on the tooth surface. This can lead to further dental issues, such as cavities or gum disease, as the plaque can harden into tartar if not properly addressed.

The other options reflect positive outcomes that would not be associated with improper techniques. For instance, increased patient satisfaction, enhanced enamel surface finish, and quicker cleaning times are typically results of effective coronal polishing practices rather than the consequence of improper techniques.