After tooth decay, trauma is the most common reason why a tooth may need a root canal. This is most common in front teeth.
It could be from something hitting the tooth, chipping the tooth, making it become loose, or even knocking the tooth out!
Endodontists are experts in managing traumatic injuries to teeth, and if a tooth is traumatized an endodontist should be consulted immediately. Timely evaluation by an endodontist can mean the difference between saving the tooth and losing it.
Sometimes the recommendation will be to monitor the tooth, do a root canal on the tooth, splint the tooth, or all of the above.