In Canada, if you go missing your family can consent to having your dental records turned over to the police, who will enter them in a national police database. The police don’t have access directly to dental records, only indirectly via family consent in cases of missing people, or via warrants in other cases.
When they find a corpse they can search the database for anyone with dental artifacts that match the body. They would then do more detailed comparisons between the body and records to try to make a positive ID.
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