Which of the following does restorative dental treatment cover?

Restorative dental treatment is primarily focused on repairing and restoring teeth that have been damaged due to decay, trauma, or other dental issues. This encompasses a variety of procedures aimed at restoring the function and integrity of teeth. Crowns fall under this category as they are used to cover, protect, and provide structural support to a damaged tooth. They are essential in restorative dentistry for both aesthetic and functional purposes, making this option the correct choice.

Preventative care and oral hygiene instruction are typically classified as preventative treatments, aimed at maintaining oral health before issues arise, rather than restoring damaged teeth. Extractions, while they may be part of the dental treatment process, do not restore a tooth; rather, they remove it entirely, thus not fitting within the restorative treatment scope.