If they don’t know who you are they can’t go to YOUR dentist, right? Is there a National database that stores all of our our bitewings – I don’t remember consenting to that! And teeth look a lot alike on those X-rays – do you need special training to tell one set apart from another?
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They don’t necessarily know your dentist, but let’s suppose you are a policeman who finds the body of a missing person. You can’t confirm for sure who this man is, but you know roughly how old that person is, and you can figure the biological sex out too, so you now know that the person in question is, say, a male, around 25 years old, and based on the decomposition, you can figure out how long ago he died, roughly 10-12 days ago lets say. Now, you crossreference this with a database of people reported missing for people who fit the time of death as well as the profile of the missing person. This already narrows the list down a lot. Now you might enter some more data, like skin color, and you quickly get down to only a dozen people or so. From here, compare the dental records of their dentists with the teeth you found with the body, and you get yourself a winner.
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