A large hadrosaur had around a thousand teeth in its mouth at any one time, if you include both the teeth being actively used in eating as well as all the replacement teeth.

一只大型鸭嘴龙在任何时候的嘴里都有大约一千颗牙齿，如果你把用于进食的牙齿和所有替换的牙齿都包括在内的话。