In the age of giant reptiles, sauropods were the biggest of all. Long-tailed, long-necked species like Diplodocus and Apatosaurus were the largest dinosaurs. From tip to tail, some sauropods were up to 40 metres long.
https://phys.org/news/2020-05-dinosaur-tooth-fossils-crucial-insight.html
https://phys.org/news/2020-05-dinosaur-tooth-fossils-crucial-insight.html