Pain in the root canal treated tooth is normal in the inetial days of the treatment when the tooth is tender because of the cleaning of root canal system & instrumentation during rct. An iopa x ray would be really helpful to evaluate the problem
Next Steps
keep on wait & watch on this tooth for the next 3-4 days and if the pain persists,visit your dentist and get an iopa xray done.
Health Tips
warm saline rinses or chlorhexidine mouthwash can be helpful to keep the area clean