Actually hydrogen peroxide is often ingested. They sell food grade versions specifically for that reason. It's suppose to help with health and increase oxygen in the body. It's also sometimes applied to something that will make it bubble and inhaled. The only real danger is that hydrogen peroxide sold for wound care contains a small amount of other things to stabilize it so it's suggested only to ingest food grade version. Other precaution is that the bubbling in your stomach will make you throw up if too much is taken, it's taken with the wrong things, or it's taken too close to a meal. Google it. You'll find hydrogen peroxide treatments are popular alternative medicine or home remedies and not toxic. However as mentioned it does have the potential to weaken tooth enamel if left on too long or used alot. I occasionally use it as a mouth wash and frequently apply it just to my tongue. Works far better than any tongue scraper or scrubbing with a toothbrush and paste and really goes a long way to eliminating bad breath and improving ability to taste.
Also not really related but peroxide is actually a really poor wound disinfectant. People get stuck on the bubbly action but in comparison to other common disinfectants peroxide cause the most damage to healthy cells leading to more scar tissue and kills the least bacteria. It's great for bubbling out debris but once the wound is clean of debris something like betadine should be used.
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