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Brush Yourself Off And Try Again: An Invention Story

Enlarge this image The MD Brush toothbrush forces users to hold it at the optimal angle relative to their gums. Shuyao Chen/NPR hide caption toggle caption Shuyao Chen/NPR When you want to change the world, a good invention helps. But that’s just the start. Take the story of Mike Davidson and Mike Smith: they wanted to change the world of dental hygiene with a new kind of toothbrush. Three years ago, their brushes were rolling off the assembly line, ready for consumers. But then the pair ran into a business…

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