Hi. As you told you are not chewing from that side for long time..Then you must visit dentist early. The particular tooth may be saved or extracted after proper consultation. By avoiding treatment, you will spoil your other teeth too.
Next Steps
you need medicine to control your pain .To know more use Practo Direct online consultation.
Health Tips
apply ice from outside. Think if you don't treat and other side teeth also suffer next time then? Take care.