Just a recommendation ! I've been having issues with a back tooth, to the point I have booked an appointment to look at having it extracted
Was using high fluoride toothpaste and sensodyne and tried Colgate sensitive toothpaste as well but was still needing painkillers
After reading reviews reddit I splurged on the biomin f toothpaste and my tooth pain has gone 
and all the rest of my teeth aren't sensitive at all now. Amazed