These teeth come from a dinosaur known as Troodon that lived during the Late Cretaceous Period (65 million years ago.). Paleontologists think that Troodon was a swift dinosaur, with sickle shaped claws, serrated teeth and a great deal of intelligence – making it a formidable carnivore for its size. (It was about 3 feet tall.) These shed teeth were found among the bones of several duckbill dinosaurs in the badlands of South Dakota.
The Children's Museum of Indianapolis
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Paleontology -- Cretaceous
Further information on this record can be found at its source.