New discovery from shark's teeth

Looking closely at the shark's teeth, the scientists found that in the teeth of this fierce animal contains fluoride, the basic ingredient in today's human toothpaste and mouthwash, they do not suffer from tooth decay or other problems.

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This helps explain why sharks bite off prey very effectively. Their teeth were perfectly designed to perform these tasks, and never had tooth decay, the study was published in the Journal of Structural Biology, said.

Shark teeth contain substances that people always need to have strong teeth.

Shark teeth contain calcium fluoride phosphate, while human and other animal teeth contain hydroxyapatite - non-organic substances also found in bone.

'To help teeth resist acid, toothpaste usually contains fluoride. After being combed, a small amount (less than 1%) of hydroxide on the surface of human teeth is changed by fluoride, " said Dr. Matthias Epple at Duisburg-Essen University and co-author of the study.

'On the contrary, the tooth surface of a shark contains 100% fluoride. In principle, sharks do not suffer from dental problems. Because they live in water and change their teeth often, they don't need to protect their teeth, " Epple explained.

In order to have a unique tooth structure, sharks repeatedly change teeth in life. The reason is not because of tooth decay, but that their teeth are often caught in prey or that some force should be lost.