What do you get when you mix rock salt, mint, dried iris flower and pepper? A taste of what could be the world's oldest toothpaste, of course.The recipe, discovered on a dusty piece of papyrus in a Viennese museum, predates the first commercial toothpaste brand by 1,500 years, UK's The Telegraph reported."Nobody in the dental profession had any idea that such an advanced toothpaste formula of this antiquity existed," said Dr. Heinz Neuman, who attended the meeting where the recipe was unveiled at a dental congress in Vienna. ...
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