When part of tooth fell off last week , you would have visited dentist soon so that you would hav not got pain by this time , I think your innermost part of tooth called pulp has exposed and infected , hence you have a pain , thee tooth may go for filling or RCT , medication can only bring down pain but not a permanent solution , so necessary treatment has to be done , kindly consult near by Endodontist
Next Steps
Need to visit Endodontist
Health Tips
Brush twice a day , rinse with warm salt water 3-4 times daily