I Started Having Tooth Ache In My Molar And Its

I started having tooth ache in my molar and its become sensitive suddenly.. I have braces and I go for regular check but no cavity and other issue has been identied by my doctor.. I in severe pain.. I have take two ibuprofen but pain us still there..I have clavam 625 at home, could you please suggest I if clavam would help and what dose is prescribe