It has, however, been shown that selenodont teeth always pass through an embryonic bunodont stage.
While the molars have the selenodont character of other Pecora, the premolars are more adapted for cutting, with sharp edges.
The type genus Xiphodon has selenodont molars and elongated, slender, cutting premolars.
The premolars are simple teeth; the molars distinctly bunodont with a tendency in one or two to the selenodont condition.
In the Pigs and their allies the crowns are bunodont, while in the more highly specialised Ruminants the crowns are selenodont.
The molars are selenodont; but as in the Tragulidae the premolars are more of the nature of cutting teeth.