From Pathfinder Lost Omens Draconic Codex, which isn't enabled.

Big Sharp Teeth

ANCESTRY FEATURE 1

Your mouth bristles with razor-sharp teeth. You gain a jaws unarmed attack that deals 1d4 piercing damage. Your jaws are in the brawling group and have the finesse and unarmed traits.

Pathfinder Lost Omens Draconic CodexORC