It meens that you dehydrated and u need to drink more fluids like water and juices. This stuff you see is a goey almost dried form of your saliva. It just means you need to drink. The same thing happens to me when i am sick
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The white film that at times can be located in the mouth is called thrush. Thrush is a part of the yeast family and can be extremely painful.
The white stuff on the side of your mouth is just dried saliva. As it dries, the solids in saliva become a greater percentage of the total mass, making it thicken.