What is a potential effect of using coarse grit pumice during polishing?

Using coarse grit pumice during polishing can indeed lead to accelerated stain and biofilm retention on the tooth surface. This is primarily because the coarse grit is more abrasive and can create micro-scratches or grooves on the enamel. While these imperfections can make the surface appear slightly cleaner immediately after polishing, they may also increase the surface area for stains and biofilm to adhere to in the future.

A smooth and polished tooth surface, usually achieved with finer grit materials, helps repel stains and can contribute to better oral hygiene, as it provides fewer places for plaque to accumulate. Therefore, while polishing is intended to enhance the aesthetic appearance of teeth, using materials that are overly abrasive may have the opposite effect in the long run by promoting conditions that allow for unwanted accumulation on the enamel.