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The T. Rex's Ferocious Teeth May Have Been Hidden By Lips

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The T. rex's large teeth are its most scary feature (Credit: Wikipedia.org/ Public Domain)

The Tyrannosaurus rex (T. rex) has always been portrayed with its razor-sharp teeth jutting out of its jaw. They are visible even when its mouth is closed. The depiction is based on its closest relative - the crocodile. Also, scientists assumed that the dinosaur's teeth, which grew up to six inches (15.2 cm) long, were too large to fit inside its mouth.