This is a lower left first incisor tooth of a great white shark (Carcharodon carcharias), with the longest part measuring 51.6mm. It is the first functional tooth in the tooth row. Typically, lower jaw teeth are used to pierce prey, so the tips and bases of the crowns are subjected to significant stress. In adult teeth over 40mm, some part is always damaged, and complete teeth are rare. It's almost a given. This tooth has a white crown and root, and the serrations are complete without any chips. The lengths of the left and right cutting edges are both approximately 40mm (38.6mm on the distal edge of the crown, 40.1mm on the mesial edge of the crown), forming an isosceles triangle. The root is thick, measuring 12mm. It has the characteristic thickness of the lower jaw, known for its robustness. The mesial root is very long, and the distal root is short, which is a characteristic feature of the first incisor. However, this tooth is no exception, and the base of the crown is damaged from the force of catching prey. Furthermore, the base of the root is worn. This is the opposite (lower left first incisor) tooth, collected from the same shark as the lower right first incisor, which was priced at approximately 100,000 yen. It may have been worn down by 2mm compared to the right first incisor. Despite being 51.6mm long and preserving the complete serrations, it's a shame... Therefore, it's classified as a B-grade item.