Hi sir...
Pain indicates that the cavity reaches pulpal layer(Nerve layer)...
Get x_ray(IOPA) of the concerned tooth done...
Based on radiographic investigation we can conclude whether you need simple filling or Root canal treatment..
You can take Tab Flexon 1_1_1x3 days for pain relief
Next Steps
kindly visit nearby dentist for furthur consultation and management
Health Tips
Medication is only temporary relief......Get the treatment as soon as possible for permanent relief..