Why do we lose our baby teeth? 我们为什么会换牙？

Together, we discover that baby teeth were never meant to stay forever, what's really happening under the gums long before a tooth ever falls out, and the animal that grows thousands of teeth in its lifetime.

我们会发现，乳牙其实从一开始就不是要一直留着的, 还有，在一颗牙齿真正掉下来之前，牙肉底下到底发生了什么事，以及有一种动物，一生中会长出成千上万颗牙齿。

Perfect for little listeners aged 5–8.