No two persons will have identical arrangement of their teeth. Thus, a positive identity can be made for one person based on the arrangement of his/her teeth. The clue can be revealed by a written note or a picture in the dental record. Going a step further, the dental X-ray may be needed to make the positive identification.
When the teeth are not attached to the jaw and the original arrangement is not present, each tooth will be examined and compared to the written record, photos, and X-rays.
Sometimes charts, X-rays, CT scans, and other assessments are used from medical records. These records can be located at Emergency Rooms, ENT offices, etc.
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