There will be more unsolved murders. There was case here in Tennessee - a tooth found - the forensic investigator concluded it belonged to an Asian female, of which there were very few in that county at the time.
It wasn’t conclusive evidence (the forensic investigator admitted that) but it was enough to get the suspect to confess.
A forensic investigator can determine male or female and race from a single tooth.
But to keep his job he has to say: “There are absolutely no differences between the sexes or races!”