At present, there is a great controversy about whether bite marks can be used as evidence for the same determination. The same premise for bite marks is based on two hypotheses. The first hypothesis is that everyone’s teeth are unique and different from others. Some scholars have calculated that the repeat probability of 3 pairs of teeth is 5.67×10 -12. The second hypothesis is that human skin limbs can faithfully record the uniqueness of such teeth. However, few scientific studies can prove the validity of the above two hypotheses. But even so, the use of bite marks as evidence in court is still recognized and accepted. 96% of professional forensic dental experts believe in the above two hypotheses. Sognnaes and other scholars studied the teeth of 5 pairs of twins, and performed a large number of measurements and comparisons on the teeth of 10 people. The results proved that the teeth of each pair of twins are different. There are four main evidences for bite marks as evidence: ①Human teeth are unique like human fingerprints; ②Some characteristics of teeth in adulthood, such as tooth cracks, crooked teeth, etc.; ③In adulthood, the size and shape of teeth change very much. Small; ④The consistency of repeated bite marks from the same individual is also called reproducibility.
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