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17 hours agohttps://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2014.00036/full
It’s been in the works for over ten years. Here is a paper on research into it from 2014.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3000521/
Here’s another one from 2010.
https://www.sciencedirect.com/science/article/pii/S1882761608000070#cesec60
And another from 2008.
Absolutely, which was my point. That the tooth thing wasn’t “only two years ago” it’s actually been in the research and development process for probably over 15 years at this point, with a long way to go.