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Mass tooth-brushing was invented in America in the 1920s by Hopkins, with Pepsodent and two basic rules:

“First, find a simple and obvious cue.
Second, clearly define the rewards.”

Excerpt From: Duhigg, Charles. “The Power of Habit.” Random House Publishing Group, 2012-02-28. iBooks.

This is how you rewire your brain. If you want to.