Peroxide mouthwashes are widely available. They're rather acidic though, IRC similar to orange juice.
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Are there magnets that they repel so strong when they are extremely close together, so that you can virtually not make them touch each other, but when they are in a distance of few millimeters, there's barely no interaction?Yes, magnets arranged in an opposing checkerboard pattern do that. The smaller the checkerboard squares are, the more short range it is. from a distance you get virtually no force.