Which type of polishing agent is considered unsafe to use on natural teeth?

Coarse polishing agents are considered unsafe to use on natural teeth because they have larger abrasive particles that can damage the tooth enamel. When used on natural teeth, these agents can create scratches or micro-abrasions on the surface, potentially leading to increased sensitivity, enamel wear, and an elevated risk for tooth decay and other dental issues.

In contrast, superfine, medium, and fine polishing agents have smaller abrasive particles that are less likely to harm the enamel. These types are designed to polish teeth effectively without causing damage, making them safer options for maintaining oral health while enhancing aesthetics. The choice of polishing agent is critical in dental hygiene practices to ensure the longevity of the teeth and the patient's overall dental health.