My sister-in-law had back surgery 7 weeks ago, and has had problems with her mouth starting the week after surgery. She has little sores all over her tongue, roof of mouth, and some going down throat. Somedays it is better and she thinks it will clear up, but then she ll wake up next morning and it will be terrible again. Painful to eat and drink, and soft drinks feel like fire. She has taken some kind of liquid antibiotics from her general physician, but didn t help. Now he has prescribed pill form antibiotics she is taking, but still hasn t had improvement. She and I have both wondered if she could have a staff infection from the tube be placed down her throat for the surgery, but her general physician won t discuss it. He keeps being vague. His nurse told my sister-in-law during her last visit, that her dad had surgery at same place 6 months ago, and has had same problems with his mouth and already tried 4 rounds of antibiotics. Any advice?