What is Boar Tooth Necklace

Mafatu’s grandfather has a necklace made from the teeth of a wild boar, which he got from a neighboring tribe where the men are brave enough to kill these beasts single-handedly. No one in Mafatu’s tribe is capable of such a feat. When Mafatu kills a wild boar himself, he makes a similar necklace from its teeth. He wants to show this to his tribe on Hikueru, to prove his bravery to them.