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Will just plain peroxide (with NO water) burn if put directly on a canker sore? How much will it burn?

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Will just plain peroxide (with NO water) burn if put directly on a canker sore? How much will it burn?

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  1. I do this all the time and I have never had it burn. If you rinse daily for 30 seconds it will help keep you from getting more of them.

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