The animal whose teeth can repair themselves is the panda. There is a natural organic substance at the tooth enamel interface of panda, which will swell when hydrated, and then the glass transition temperature will decrease, so that the tooth enamel can repair itself.

Panda characteristics

From the fossils found, it shows that a branch of primitive panda evolution is called agriarcros goaci, which distributed in humid forests in Europe, Hungary and France and became extinct at the end of Miocene. The main branch evolved into a giant panda in south-central China, one of which was called a miniature giant panda, which appeared in the early Pleistocene about 3 million years ago.

Smaller than a panda, its fossil is named giant panda. Inferred from the teeth, it evolved into an omnivore and an egg-laying bear, and also ate bamboo. Since then, this main branch has expanded to the subtropical region.

Fossils are widely distributed in North China, Northwest China, East China, Southwest China, South China, Vietnam and North Myanmar. In this process, the giant panda adapted to the life of subtropical bamboo forest, gradually became bigger and lived on bamboo.