I was having a friendly conversation yesterday when someone was extolling the virtues of Japanese documentaries as being extremely interesting and exciting. One of the things she claimed to have learned from these programs was that babies are born without the bacteria in their mouths to produce cavities. Apparently, the bacteria are usually introduced into the mouths by ignorant parents who spoon feed their little one with spoons that the parents had already used, thereby passing the cavity-causing-bacteria along to the next generation. She cites this as the reason why some people never seem to get cavities no matter what they do and others get them simply by looking at sweets.
I’d love to be able to blame my parents for the dentist trips I’ve had endure in order to fix my rotting enamel, but I have a strong suspicion that this smacks of urban legend. So tell me, what’s the Straight Dope on tooth decay?