Xerostomia is that disease or disorder which is responsible for drying of mouth.
Dry mouth is also called xerostomia. It is refers to a condition in which the salivary glands in mouth don't make enough saliva to keep mouth wet. This disease occur often due to the side effect of certain medicines, aging issues or as a result of radiation therapy for cancer.
So we can conclude that xerostomia is that disease or disorder which is responsible for drying of mouth.
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