Before performing coronal polishing, which of the following is essential to assess?

Assessing the patient's medical history before performing coronal polishing is essential because it provides critical information about the patient's overall health, potential allergies, and any medical conditions that may affect the procedure. This information helps ensure that the dental hygienist or assistant can provide safe and effective care tailored to the individual needs of the patient. For example, certain medical conditions or medications may increase bleeding risk or indicate sensitivity to certain materials used during polishing.

In contrast, while the color of teeth can provide insight into cosmetic outcomes, it does not influence the safety or appropriateness of the coronal polishing procedure. Similarly, understanding the patient's current toothpaste brand or recent dental advertisements does not directly impact the procedural elements or patient safety associated with polishing. Therefore, focusing on the medical history is crucial for a comprehensive assessment and to deliver the best care possible.