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How to make hydrogen peroxide into a gel or just simply really thick and it has to be able to be in your mouth?

The only thing i have came up with is (Gelatins). What should i use?

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There are a number of vegetable gums, such as carageenan, pectin and gum arabic, and man-made methyl cellulose which might be compatible with low concentrations of $\ce{H2O2}$, which you can determine easily. Any impurities, particularly transition metals, may make $\ce{H2O2}$ decompose, so it might be best to keep the gelling agent and peroxide separate until just before use.

If for oral use, this site suggests 0.75% to 1.5% solutions, one quarter and one half the strength of the common antiseptic N.B. $\ce{H2O2}$ bleach is much stronger and is not for oral use. Note that there are dangers with use of peroxide as a mouthwash.

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gels are of different types and shelf lives. If you are thinking of a true gel (water gel) then natural gums like guar, carrageenan, pectin, gum Arabic, etc are not useful. The gel will break down within no time. There are no material that can give hydrogen peroxide a good viscosity with shelf life more than 7 days.

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