Nothing works for sensitive teeth.  Been to two ntdentists.  Have used sensodyne, Rx toothpaste, had mouthguard made for clinching, then teeth trays for fluoride/potassium nitrate treatmes.  Nothing has helped.  Have never had teeth problems until last cleaning over a year ago.  Finally changed dentist and tried gluma and in office fluoride treatment still cannot drink anything above room temperature or eat anything cold.  51 year old post menopausal female
Hello and welcome. After reading your complete history it appears that you require clinical evaluation. You can approach Endodontist (dentist dealing with root canal treatment) in this regard. Every single tooth should be thoroughly examined for the origin of pain. Then, if required root canal treatment should be started for the concerned teeth. You also require intramural radiographs in this regard. Hope it helps. Thanks. Take care.