 However, they noted that teeth are structurally strongest at their tips, not on their sides, under the high stresses of crushing bites.They suggested that the jaw may have been twisted during preservation, or soft tissues like collagen which held up the teeth in life may have been lost, although they conceded that neither hypothesis would explain the wear patterns.Finally, they noted that the lower teeth without corresponding upper teeth were unusual; they show no wear patterns, and there is no evidence of muscular mechanisms which would have allowed the two jaws to be used against each other.