Dryness in the mouth is not an agreeable sensation and much less so if the condition becomes an illness. Effectively, there are illnesses related to lack of saliva, as is the case of the sicca-sicca disease and the Goujerot-Sjögren syndrome.
Goujerot-Sjögren syndrome mostly affects elderly women
The research regarding these uncommon illnesses began to be important in 1976 when new functions of the molecule ATP (adenine triphosphate) were discovered. In that year it was found that the ATP molecule and its derivative controlled a number of biological processes and, based on those results, research began on the relation between ATP and the secretion of saliva.
This research had both biological and medical interest, for example, in order to cure the above-mentioned ailments.
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