Most carnivorous mammals have a blade-like tooth called a carnassial. To demonstrate the geometry of the carnassial tooth, this model was created, showing the way in which the V-shaped blades meet to trap and cut food. The matching blades are shown in red.
Source: Evans AR, and Sanson GD. 2006. Spatial and functional modeling of carnivore and insectivore molariform teeth. *Journal of Morphology* **267**: 649-662.