The term 'Mouth Piece' can be broken down into two crossword solutions: LIP (3 letters) and DENTURE (7 letters). A LIP is the fleshy outer part of the mouth, which is used for speaking, eating, and facial expressions. A denture is a removable prosthetic device that replaces missing teeth and provides support for the cheeks and lips. Together, these two solutions form the term 'Mouth Piece, ' which is a general term for any device that is placed in the mouth to help with speaking, eating, or other activities.