Cog Piece is a term used to describe a TOOTH, which is a five-letter word. Teeth are an important part of the human body, as they are used for chewing and speaking. They are also essential for maintaining good oral hygiene. Teeth are made up of several parts, including the enamel, dentin, and pulp. The cog piece is the part of the TOOTH that is visible above the gum line. It is composed of enamel and dentin, and it is the hardest part of the TOOTH.