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Hey kids, wash your teeth off with soap

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Liquid Tooth Soap (left) next to shredded Tooth Soap (right). (Madeline Lewis)

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More Americans are tossing toothpaste aside for a mouth-cleansing throw back: soap. Entrepreneurs are adding flavors so it doesn't taste so much like, uh, soap. But some dental experts aren't convinced that soap is best for that clean, fresh feeling.