Title: 7 Fascinating Facts About Narwhals | Mental Floss
Headings: 7 Fascinating Facts About Narwhals
7 Fascinating Facts About Narwhals
1. Its tusk is actually a tooth
2. The tusk can grow to be 10 feet long
3. It can bend about a foot before breaking
4. We’re not entirely sure what it’s for
5. Not all narwhals have tusks
6. Their skin is rich in vitamin C
7. There are none in captivity

Content: Here’s what we know about them. 1. Its tusk is actually a tooth
While it might appear to be situated in the center of its head, the narwhal’s tusk is actually an exaggerated front left tooth that protrudes from the upper lip. The right front tooth is small, and usually remains in the mouth. Stranger still, while most teeth (including human teeth) have a hard exterior and a soft, sensitive interior, narwhal teeth are the opposite. “ No big surprise. It's been opposite in every other way,” Martin Nweeia, a clinical instructor at the Harvard School of Dental Medicine, told NPR after making this discovery. “ But to find a tooth that is soft on the outside and has its most dense part around the pulp was completely odd.” 2. The tusk can grow to be 10 feet long
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Narwhal tusks grow throughout the animals’ entire lives and can reach incredible lengths.