Is she taking any meds or does she have a problem with dry mouth? Certain meds can cause this and some meds can cause drt mouth, which can cause this. Other than that I don't have much of an idea. I didn't have any issues with this except when I was in the hospital and not allowed to eat or drink for 2 to 4 weeks.
Nissen 6/06 and 5/09
#3 on 8/24/11