Please, always check your spelling before submitting questions! There is no such dinosaur as "admantasaurus." The dinosaur in question is Anatosaurus, now listed as Edmontosaurus.

According to a Google search for "dinosaur 'most teeth'", Anatosaurus (or Edmontosaurus) had the most teeth of any known dinosaur: 1600 or so.

For more about dinosaurs, visit your library; several excellent dinosaur reference books have been published in the last few years. There are also many reputable websites about dinosaurs; one of the most comprehensive is the Dinosauricon, which is constantly growing and maintains a huge list of reviewed links.

I'm a stickler for accuracy partly because my son is such a huge dinosaur fanatic.