Bacteria are not the sole cause of caries; tooth resistance also plays an instrumental role.
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edit:Travis, thanks for putting the nifty news up for us.
The researchers need a remedial course in logic.
They claim all creatures with marker A have result B is a proof of causation. Oh boy. Nope. Casual link.
Show me that all B results have A marker, then you can say you proved causation.
They may have a better understanding of the material than how to present the results and have actually done what they claim, but it ain't working on the abstract.