Myth: Tongue is the strongest muscle in the Human Body
Reality: It is true that the tongue does not get tired and is constantly working. It is essential to mixing food in the mouth. It helps us form letters for verbal language. The tongue contains lingual tonsils that filter germs. Even when a person sleeps, the tongue is constantly pushing saliva down the throat. The tongue is strong and important, but not the strongest muscle.
Source: http://factmyth.com/factoids/the-tongue-is-the-strongest-muscle-in-the-human-body/