Not all teeth that need crowns will need root canals. If the nerve of the tooth is still healthy, then the top part of the tooth can be replaced with a crown. However, most teeth that have had a root canal will need a crown. Teeth with root canals can become weaker with time and a crown will reinforce the tooth, allowing it to function longer.
Congratulations to Dr. Quattlebaum on completion of his courses with the Dawson Academy!