Leaving root canal debris in the pulp chamber and pulp horns can discolor an anterior tooth

Patient: 23 year-old female with a history of heart mumurs

Chief Complaint: discolored front tooth (Tooth #8)

Dental History: The patient reported that her maxillary right central incisor had been treated with root canal treatment within the previous two years and that the tooth had become dark. She reported a history of bruxism and caries in the sextant. She also reported wearing a night guard.