I thought I was being paranoid until I started reading the article
I choose to believe this is a freudian slip, which means they're trying to cause tooth decay while pretending to do the opposite.
If I were dentistry as a business, I wouldn't like this permanent (final) solution to tooth decay because of my unreasonably suspicions that the odontological treatment I received as a child was unconsciously intended to make me continue to need 'dental care' instead of fixing anything. Last time I was at a (very expensive private) dental clinic the treatment they pushed on to me was killing my tooth so I would buy one. I'm pretty sure some hugely powerful branch of dentistry is betting on people in my demographic (who get their teeth killed off) buying a full set of teeth from them in the future.
But I would only accept Thompson teeth, the only teeth capable of chewing other teeth
The author addresses this under the header "2.1: As users kiss their loved ones, who kiss others in turn, will this spread exponentially and take over the world?"
Given that it's an oral colonist it seems likely that the author has tried the free sample as well, even if they were to live in a no-kissing houshold.
The title is a lovely garden path sentence: "A genetically modified bacterium that outcompetes bacteria causing tooth decay" -- a straightforward parse leads you to the plausible assumption that the genetically modified bacterium causes tooth decay. The insertion of a "the" before "bacteria" would remove the ambiguity.