For RCT treated tooth pain, need a x ray n proper history of root canal. If their is pain and you are not able to eat from that side, their might be reinfection. If you want your teeth to be aligned you can go for braces or orthodontic treatment. Mouth ulcer can occur due to many reasons, proper history is needed.
Next Steps
(-) Visit a dentist or video consult
(-) Brush twice a day
(-) Maintaine good oral hygiene
(-) Can take painkiller if needed
Health Tips
Visit a doctor or video consult for proper treatment plan n diagnosis