Topical science magazine. Geoff Watts visits the Bureau of Legal Dentistry laboratory in Vancouver, Canada. Forensic dentistry is a specialised area, but one that can uncover important evidence in the most grisly of cases. Dr David Sweet runs the lab and is one of the few forensic dentists in North
America. He explains how the DNA encased in teeth is often the only option left to investigators in the hunt for information. Producer Alexandra Feachem