Final answer:
Trina injures her two front teeth by falling out of a swing, which resulted in a loose and a completely broken tooth.
Step-by-step explanation:
The student is asking about how Trina, a character in a story, injures her front teeth. Trina injures her two front teeth by falling out of a swing the preceding afternoon. As a result, one of her teeth was knocked loose and the other completely broken out. In dental terms, she would need treatment for an avulsed (knocked out) tooth and a subluxed (loosened) tooth. In the narrative, McTeague, the dentist, examines her mouth, noting that she has beautiful teeth apart from the injury. McTeague considers the possibility of using a dental crown or bridge to address the disfigurement caused by the tooth injury.
A thorough examination by McTeague reveals that one tooth is loose, discolored, and dead—a condition known as necrosis of the tooth which is quite rare. It is determined that the roots of the broken tooth are still in the gum and will need to be extracted. The other bicuspid that was knocked loose might also need to be pulled out. This situation creates a dilemma since removing both teeth would create two visible gaps in Trina's otherwise perfect set of incisors. McTeague's professional consideration includes potential restorative treatments to maintain the aesthetic appearance of Trina’s smile after resolving the immediate dental emergency.