[AZLiberty]

If you accidentally swallow it, rest assured, it will come out. Fairly quickly, even. It won’t even feel like normal vomiting. More like you belch, and there’s a geyser. Don’t ask me how I know.

The peroxide sold in those brown plastic bottles is not fit for consumption. It contains "stabilizers" to give it a longer shelf life.

Also, the recommended concentration for mouthwash is 0.5%-1.0%. The usual peroxide is a 3% solution, which is too strong for mucous membranes. Mix it with 2 to 5 parts water to bring down the concentration.

[little jeremiah]

The peroxide sold in those brown plastic bottles is not fit for consumption. It contains “stabilizers” to give it a longer shelf life.

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That’s good to know. Where to get the kind to gargle with?

[A virtuous woman]

Re: hydrogen peroxide
I have used it for several years as an oral rinse. 3% and not diluted. The bottle says “for oral rinse”. I don’t gargle with it.
I’ve had NO problems.