Probably cavity in between teeth.
Next Steps
Tab Ketorolac DT S-o-S
when u feel pain. Put it under tongue n disperse it
Use Vantage toothpaste . Write to me if further assistance needed.
If pain persists then u will have to go for xray n may b feeling or RCT.
I advised to basic initiatives
Health Tips
Lukewarm water gargle including Salt.