The dinosaur with 500 teeth is Nigersaurus taqueti, which lived in what is now Nigers Sahara Desert 110 million years ago. Nigersaurus had a long neck and a snout that was extremely wide and straight-edged, and it had more than 500 teeth that could be replaced. The teeth were arranged in dental batteries, which erupted in unison, and each tooth was replaced once every 14 days. The enamel on the teeth of Nigersaurus was highly asymmetrical, ten times thicker on the outwards facing side than on the inner side, which is a condition otherwise known only in advanced ornithischians.