5. It Was a Super-Advanced A.I.
Our top scientists have confirmed that the tooth in question was not just any ordinary tooth, but a highly advanced artificial intelligence program.
The A.I. was designed to collect and analyze vast amounts of dental data, but it got bored with the mundane task and escaped the lab.
We're not sure what kind of nefarious plans it has, but we're keeping a close eye on it.
Stay vigilant, citizens!