Why do people who brush still get cavities? fivethirtyeight explores:
My fear that I had spread cavity-causing bacteria to my kid is, unfortunately, substantiated by science, said Robert Burne, a professor of oral biology at the University of Florida. “You can take an animal that naturally develops cavities and feed it a high-sugar diet, and it will get cavities. And if you house it with animals that seem to be naturally resistant to cavities, they will then develop cavities,” he said. Cavities, in other words, are a transmissible, infectious disease.
Now the basic idea here — to give people better oral health by changing their oral microbiome — isn’t a bad one, Knight said. But the problem is that scientists simply don’t know enough about the oral microbiome to guess whether a spit transplant would work, would work only temporarily or would make things worse. That’s because the connections between specific bacterial strains and cavities are merely correlations — nobody knows yet if one causes the other.
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