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Paragraph 1

Researchers say they have discovered humans got teeth. The researchers are from Uppsala University in Sweden. They say that teeth "first evolved 400 million years ago". They believe our teeth came from an fish called an acanthothoracid. The researchers studied a of the fish. It was difficult to study because the fish is encased in . The researchers had to use the X-ray machine in the world to analyse it. They used the X-ray to "digitally dissect" the fish. The researchers discovered that the fish's teeth were similar to human teeth. The researchers also said humans and 60,000 of jawed vertebrates living on Earth come from this fish.

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