Sharks change their teeth all their lives. If they use a bad pair, they will change it. They change clothes more diligently than we do, which makes those who have cavities envious.

However, as we all know, teeth are the hardest tissues in animals, and it is quite difficult to produce such a pair of teeth. Why can sharks keep changing them?

In fact, we are all deceived by the lie that sharks change their teeth all their lives. In essence, sharks actually change their teeth, but their scales-qualitative scales!

Related knowledge:

All teeth are basically composed of three basic structures: enamel, dentin and pulp. The hardness of enamel can reach grade 7, while the hardness of bone is only about half.

However, sharks belong to the subphylum of vertebrate cartilaginous class. All the bones in its body are made of cartilage, and there is no real bone tissue. At the same time, the exoskeleton degenerates, and its body surface is covered with leather teeth, that is, plasmodesmata. In other words, even if a shark wants to have teeth as hard as humans, there is no way, because it has no such function at all.