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Mouth dissolving films is a new drug delivery system for oral route. This delivery system consists of a very thin oral strip, which is simply placed on the patients tongue or any oral mucosal tissue, instantly wet by saliva, film rapidly hydrates and then disintegrates and/or dissolve to release the medication. In the formulation of oral film, the most important ingredient is polymer which helps in film formation. Mainly hydrophilic polymers are used in mouth dissolving films. The present article highlights various natural and synthetic polymers, their properties and applications in oral film delivery system.