Severe Tooth Decay: When a cavity is left untreated and grows deep enough, it can reach the pulp, causing infection and pain. Trauma or Injury: If a tooth is knocked or hit hard, even without visible cracks, the pulp can become damaged or inflamed, requiring treatment. Persistent Tooth Pain: If you experience sharp, intense pain, especially when chewing or applying pressure, it cou... https://cornealdent.com/root-canal-treatment/