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90% Reduction: Scientists Discover Natural Molecule That Eradicates Plaques and Cavities
(scitechdaily.com)
it is the place for high quality scientific content that doesn't necessarily reference a peer-reviewed paper from the last 6 months.
If I'm reading that link correctly, you need to digest the kale to release it, so it's not going to help your teeth. Unless it can also come out via cooking or saliva?