simple dental caries if left for prolonged time then the caries may extend to pulp and cause severe pain. if the pain is during night also than the diagnosis may be chronic irreversible pulpitis.
Next Steps
Take antibiotics and a pain killer for temporary relief. consult a dentist .get an x ray done, if cavity/caries extends till then go for root canal treatment.
Health Tips
Take cifi 200 twice daily.and diclomol twice daily for temporary relief. avoid chewing from the painful side.