Dry mouth is a condition in which the mouth has little or no saliva. The effects of a dry mouth go beyond the feeling thirsty — as it can affect the taste and digestion of foods and drinks. Other symptoms dry mouth are cracked lips, the mouth feels tight and dry, sores in the corners of the mouth, and difficulty swallowing.
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http://www.webmd.com/oral-health/ss/slideshow-dry-mouth