Which ancient civilization invented the first known form of toothpaste, using ingredients that included crushed eggshells and ox hooves?

Many of today's everyday consumer products have fascinating origins in ancient civilizations. While we may think of product innovation as a modern concept, ancient peoples were remarkably resourceful inventors, creating early versions of items we still use today. This trivia question challenges you to identify which ancient civilization made a groundbreaking innovation that transformed into a common consumer product we recognize today.

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Ancient Egyptians (around 5000 BCE)
Ancient Greeks (around 500 BCE)
Ancient Chinese (around 300 BCE)
Ancient Romans (around 200 BCE)