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One possibility is that it is a learned behavior that evolved from kiss feeding, the process by which mothers in some cultures feed their babies by passing masticated food from mouth-to-mouth. However, there are some contemporary indigenous cultures which still practice kiss feeding, but not social or erotic kissing.
1 this is a stretch because I don't know if adults can get this, but candida/yeast forms on the inside of newborn babies' mouths... 2  Hi, thanks for the reply. 3  I had the same things and I figured out that it happens when i brush my teeth too harshly. i think its because ofthe friction. 4  Interesting...I suppose that could be it.