Endodontic treatment becomes necessary when the pulp ( the soft tissue inside the root canal) becomes inflamed or infected. The inflammation or infection can be caused by a variety of reasons: deep decay repeated dental procedures on the tooth or a crack or chip. In addition, an injury to a tooth may cause pulp damage even if the tooth has no visible damage. If pulp inflammation or infection is left untreated, it can cause pain or lead to an abscess.The following symptoms could mean you need a root canal—
Severe pain while chewing or biting
Pimples on the gums
A chipped or cracked tooth
Lingering sensitivity to hot or cold, even after the sensation has been removed
