I first heard about making homemade toothpaste back in high school, from a science teacher named John McCullough. “Commercial toothpaste is a scam,” he declared, and then he broke down the science behind why you could get at least the same or maybe even better results if you simply took hydrogen peroxide and baking soda, mixed them together into a paste, and used that to brush your teeth instead. He assigned this little craft experiment to all of us enrolled in his freshman Introduction to Physical Science class, as homework.

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