Aspects of this topic are discussed in the following places at Britannica.
...the Late Cretaceous Period (227 million to 65 million years ago) and were one of the most successful and enduring dinosaur lineages. Ornithopoda consisted of several subgroups, including Fabrosauridae, Heterodontosauridae, Hypsilophodontidae, Iguanodontidae, and Hadrosauridae (the duck-billed dinosaurs). The fabrosaurs were the earliest and most primitive of the ornithopods; these...
in dinosaur: Ornithopoda )In the fabrosaurids the teeth were simple leaf-shaped, laterally compressed elements arranged in a single front-to-back row in each jaw. They were not set in from the outer cheek surface as in most ornithopods. Small incisor-like teeth were borne on the premaxillary bones above, but (as always) no teeth were present on the predentary below. One pair of incisors had been lost. The lower jaw had...
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