You get X-rays, mouldings, 3D modelling etc of your mouth/teeth from time to time at the dentists. The size, shape, layout etc is unique to you, like a fingerprint.
The enamel on your teeth is a super hard to destroy material. So it’s likely it survives many situations where a person gets killed. It’s likely to survive situations where the rest of the body is damaged too.
So they match up the teeth they find in the body to the records from your dentist.
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