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What is Koplik spots on the buccal mucosa are seen in relation to which of the following teeth? and explain in detail?
Koplik spots: pathognomonic of measles 
The Koplik’s spots are white papules resembling table salt like crystals with a red base, which appear usually on the buccal mucosa opposite to first and second molar teeth. 
Ref: Shafer's textbook of oral pathology 7th edition page 348