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Episode 31. Topic: The history of toothpaste. Theme: Hygiene. The history of toothpaste. How old is toothpaste and what did it look like before we understood the causes of tooth decay?
By 3MLEpisode 31. Topic: The history of toothpaste. Theme: Hygiene. The history of toothpaste. How old is toothpaste and what did it look like before we understood the causes of tooth decay?