While not every tooth that undergoes a root canal requires a crown, many do. The process of root canal treatment can render teeth dry and fragile, necessitating the addition of crowns for reinforcement. The decision regarding whether a crown is necessary largely hinges on the degree of chewing force the tooth endures. Molars that have undergone a root canal treatment are more likely to require a crown for support. Conversely, teeth located towards the front of your mouth might not need a crown at all.