Which of the following does restorative dental treatment cover?

Restorative dental treatment is primarily focused on diagnosing and treating dental issues that involve repairing damaged teeth or replacing missing ones. Crowns are part of this category, as they are designed to restore the shape, size, and functionality of a tooth that has been severely damaged or decayed. They serve to protect the remaining tooth structure, ensuring that the tooth can function properly within the bite while also maintaining aesthetic appearance.

X-rays and cleanings, while essential components of dental care, fall more under preventive or diagnostic services rather than restorative procedures. Dentures, although they do replace missing teeth, are typically classified as prosthetic treatments rather than restorative ones. Thus, crowns most accurately represent restorative dental treatment as they directly address the repair and restoration of existing teeth.