In fact, the majority of teeth that have undergone root canal treatment, which is commonly known as denuded teeth, need to be protected by a crown. We all know that the middle of the tooth is the pulp in the place, in fact, from the point of view of the force is equivalent to the empty, root canal treatment must be from the upper entrance, so that the upper body of the tooth must be removed, so that when the tooth is under pressure without the support of harder dental tissue, it is easy to split. Clinically, we can see many friends splitting the tooth before hospital treatment, the scope of the splitting is limited to the crown part of the tooth, you can do pile crown repair, if the splitting to the deeper part of the root can only be considered extraction. So after the root canal treatment must be done in time for the crown restoration, crown restoration is part of the dental restoration, not optional!