This "root" canal reaches into a portion of the crown as well. Once decay enters this level of the tooth, bacteria invades the inside of the tooth resulting in an abscess, which if left untreated, can become very painful.
Therefore, the way to prevent root canals is to address decay when it is small and before it reaches the inner level of the tooth.
In some cases, root canals are necessary to treat teeth that have been traumatized. The prevention is to avoid trauma. You may need your bite adjusted, a night guard fabricated, and you definitely need to wear a mouth guard while playing sports. A mouth guard for athletes is a must!
Don't forget to buckle-up while riding in a vehicle. Accidents at slow speeds with no seat belt can cause severe injury to teeth that contact headrests or dashboards.
Check the vehicles in which your children ride. I saw a school/church van-load of children just after an accident. The vehicle was not equipped to buckle-up all the children. 9 out of 13 of the children hit the seat in front of them and injured their front teeth.