Which option describes what can be done with an avulsed (knocked-out) tooth?

An avulsed tooth may indeed be saved if it is re-implanted promptly. When a tooth is knocked out, the chances of successful re-implantation are highest when the tooth is handled with care and replaced into its socket as soon as possible, ideally within 30 minutes. It is important to hold the tooth by the crown (the part that is normally exposed in the mouth), avoiding touching the root, to minimize damage to the periodontal cells. If immediate re-implantation is not possible, the tooth should be kept moist, ideally in a saline solution or the patient's own saliva, while seeking dental care.

The other options suggest actions that do not align with the best practices for treating an avulsed tooth. Discarding the tooth would forfeit the opportunity for re-implantation, while suggesting it can heal on its own overlooks the fact that a tooth requires support from the surrounding tissues to survive properly. Also, while consulting a dentist is important, implying that re-implantation should be deferred solely to a dentist disregards the critical time window for action that could take place before obtaining professional care.