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。
Tooth replacement
原声例句
阿尔伯塔大学-恐龙古生物学
英语百科
Tooth loss
（重定向自Tooth replacement）
Tooth loss is a process in which one or more teeth come loose and fall out. Tooth loss is normal for deciduous teeth (baby teeth), when they are replaced by a person's adult teeth. Otherwise, losing teeth is undesirable and is the result of injury or disease, such as dental avulsion, tooth decay, and gum disease. The condition of being toothless or missing one or more teeth is called edentulism.
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