Hi My Name Is Victor From Kenya. I Have Heard

hi my name is victor from kenya. i have heard a chronic nose/mouth smell that doesnt go even 2 seconds after brushing. i have tried the flip turn sinus flush to take care of the nosal area(if it were the course) but still nothing, i have also tried over the counter mouth wash but still unsuccessfull. the dentist is also unable to figure it out.. EVEN AFTER LITERALLY BRUSHING MY MOUTH OR EVEN WHEN I AM SILENT AND ONLY BREATHING PEOPLE CAN STILL FEEL IT. PLEASE HELP IT HAS BEEN THERE SINCE I WAS YOUNG. I EVEN DONT KNOW WHERE TO GO TO, FEEL LIKE KILLING MYSELF?