The location of the chin and tongue muscle: you can tell by its name, it is mainly a muscle that connects the chin and the tongue, you can put your hand on the soft tissue of the chin to do the swallowing action, it will be obvious to feel a piece of muscle with a protrusion, this piece is the chin and tongue muscle. It is mainly to help the normal chewing movement in the oral cavity or speech, pronunciation, the oral cavity of many muscle groups, the lack of any one, there is no way to do swallowing or pronunciation, and the muscles in the oral cavity is very flexible. If any of the muscles are stiff, it will affect the ability to do facial expressions and even drooling.