"Desmatosuchus" had blunt, bulbous, slightly recurved teeth. Furthermore, they are believed to have had homodont dentition. This, combined with its shovel like snout, indicate that "Desmatosuchus" fed by digging up soft vegetation. This method of feeding is further evidenced by its toothless premaxilla and dentary tip, which were covered in horny sheaths. These sheaths protected the bones and could be used for cutting or holding objects. It is believed that "Desmatosuchus" dug for food in the soft mud near bodies of water due to the abundance of lakes and rivers in the Dockum area and the fact that "Desmatosuchus" scutes are often found among parts of other reptiles that are known to have fed along waterways. It is unknown whether or not "Desmatosuchus" replaced their teeth and, if so, how. The low number of "Desmatosuchus" teeth that have been discovered indicates that they were only held in place by soft tissue connections. The jaw articulation point is below the tooth line, holding its upper and lower tooth rows parallel while biting in a way that is reminiscent of ornithischian dinosaurs.