How is a polishing cup applied to the tooth surface during coronal polishing?

The application of a polishing cup to the tooth surface during coronal polishing is performed with slow speed and light pressure to ensure effective cleaning and to prevent damage to the tooth enamel or surrounding tissues. This technique allows for the removal of plaque and stains without causing discomfort to the patient or harming the tooth structure. Using a slow speed helps to control the polishing process, allowing for more precise and gentle contact with the tooth surface. Light pressure is essential to avoid unnecessary abrasion, as excessive pressure could lead to enamel damage or cause sensitivity in the teeth.

The other approaches mentioned would not be suitable for coronal polishing, as high speed and heavy pressure could lead to over-polishing or damage, pulsating pressure might not provide a consistent or effective polish, and a harsh scrubbing motion could irritate the gums or damage the tooth surface rather than effectively cleaning it.