During root canal treatment, we essentially have drilled a whole through the center of the tooth, so that we can clean the canals where the nerves are. However in doing so, we essentially weaken the tooth, and makes the tooth more fragile and prone to fracture.
A root canal treated tooth with a crack
A simple filling can create a wedging affect in the root canal treated tooth, making it prone to fracture
Even though in the short term, root canal treated teeth can function fine, over time fractures can occur, eventually leading to the loss of the tooth (and time, money wasted on treatment!).
By placing a crown over the tooth after root canal treatment, we reinforce the tooth structurally and reduce the risk of fractures . It does so by bracing the entire crown of the tooth (like post stumps) to prevent the tooth from splitting when you bite down.
Although there’s an increased fee with a crown after root canal, it’s definitely worth the investment after the time and money you’ve already spent in keeping the tooth.