Which of the following should be avoided when performing a mechanical polish?

Applying excessive pressure during a mechanical polish can lead to several adverse effects that can compromise both the procedure and the patient's dental health. When too much pressure is applied, it can cause overheating of the tooth surface, which may harm the pulp and surrounding tissues. Additionally, excessive pressure can result in the removal of too much enamel, potentially leading to sensitivity or increased cavity risk. Therefore, maintaining a light, consistent pressure is essential for effectively polishing teeth without causing damage.

The other practices mentioned, such as keeping the cup moving before contacting the tooth, using the ring finger as a fulcrum, and polishing in a specific direction from gingival to occlusal/incisal, are generally considered acceptable or even beneficial techniques when performing a mechanical polish. These methods help ensure a smooth and controlled polishing process, allowing for better access and coverage of the tooth surface while minimizing the risk of injury or discomfort to the patient.