Is it necessary to put cap after root canal treatment? A dental crown after a root canal provides reinforcement to your tooth and restores its health and functionality. Although adding a dental crown is not necessary after every root canal procedure, all root canal procedures need tooth reinforcement. If the tooth had previous damage or is now a lot weaker because all of the pulp has been removed, then a dentist will often put a cap over it to keep it strong so that no further damage is done. ... It is essential for all teeth to be as healthy as they can be so they can function correctly