The most distinctive part of the anatomy is Laquintasaura is found in its dentition, with numerous autapomorphies found therein. The teeth are unusually long, tapering from the central apex of the and forming an isosceles triangular shape overall. Coarse denticles run along the entire crown margin (the edge of the exposed tooth). The teeth are laterally widest near this apex, and they possess uniquely prominent striations on both the inside and outside sides of the tooth. This anatomy is seen among all teeth in the bonebed sample, indicating it was likely uniform throughout the entirety of the mouth, both in the and the . The premaxilla of L. venezuelae has seven teeth in each position and does not present a diastema close to the premaxillo-maxillary suture. Such a high number of premaxillary teeth is uncommon in ornithischians outside of some members of Ankylosauria; later members of Ornithischia would reduce their premaxillary tooth count until many didn't possess any whatsoever. The high count in Laquintasaura elucidates the basal state of having many teeth, and indicates its dental anatomy is very primitive even compared to other Early Jurassic taxa.
