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This is Tone 28 solid toothpaste that I learned about through a friend's recommendation.
I was also fascinated at first, thinking, "So something like this exists."
It looks like a pill, so I put it in a small bag to carry around when I go out. It's great to use when you want to brush your teeth but feel uncomfortable carrying toothpaste, and just using mouthwash isn't enough.
It lathers well, just like regular toothpaste, and cleans thoroughly and leaves a fresh feeling.