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I'll wait for more and longer term studies before I try it. Maybe it slowly erodes teeth, or destroys amalgam fillings since it's EDTA.

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I was going to say... EDTA is also suspected to be the primary active ingredient in Evapo-Rust: https://www.youtube.com/watch?v=xf3ma1XFt9Y

So? That doesn't mean anything. Water is an ingredient in both, too.

EDTA is used in food, medicine, and dentistry. It's ingested, inhaled, and injected into people every day.[1]

In the video you linked Adam Savage reads out the safety warnings from the Evapo-Rust bottle ("non-toxic, biodegradable, safe on the skin and eyes") and from the Evapo-Rust SDS[2] it seems like a pretty darn safe product.

[1]https://en.wikipedia.org/wiki/Ethylenediaminetetraacetic_aci...

[2]https://evapo-rust.com/wp-content/uploads/2018/08/Evapo-Rust...

Acids such as citric acid are also very safe, but definitely not in the context of brushing teeth as they dissolve enamel. There simply isn't enough safety data _in that context_ for dentists to start recommending EDTA vs regular fluoride toothpaste. In one in vitro study I found, EDTA is shown to cause erosion https://www.medigraphic.com/pdfs/odon/uo-2012/uoi121b.pdf so I'd say more studies are required.

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