Subject 6391-A, also called Cracktooth, was a Wookiee female who was forced into slavery under the command of Grand Moff Lozen Tolruck in 5 ABY. The majority of her teeth were lost as she attempted to sever her bonds with her mouth. Due to Cracktooth's docile nature, Tolruck employed her as both a personal attendant and horticulturalist. Cracktooth, along with other Wookiees residing on the planet of Kashyyyk, had inhibitor chips implanted within them to maintain obedience. Following Sinjir Rath Velus's disabling of the control mechanism for these chips during the liberation of Kashyyyk, Cracktooth retaliated against Tolruck, her one-time oppressor, and fatally snapped his neck.