The purpose of this study is to document by survey the occurence of tooth pain present 3 months and 6 months after root canal therapy in the patients recruited for the DPBRN "Peri-operative tooth pain" study. This study will access the feasibility of obtaining 3 month and 6 month follow-up data on the patient enrolled in the DPBRN "Peri-operative tooth pain" study.

Inclusion Criteria:

• 19-70 years old
• Permanent adult tooth requiring its first non-surgical root canal therapy
• patients with more than 1 tooth requiring root canal therapy are eligible, but only the first root canal procedure will be included to avoid problems of correlation within patients

Exclusion Criteria:

• evidence of prior root canal therapy, including iatrogenic, but not disease-induced pulp access of the tooth being considered
• patients with obvious cognitive impairments (e.g., past stroke with communication deficits, dementia,mental disability)
• patients unable to return for 6 month follow-up

The participants directly involved in this study are the patients who have sought dental treament in the practitioner-investigators' practices. The practitioner-investigators will be endodontists and general dentists.