Tooth forms one-third of the identical triplets designated the Mouth, alongside Lips and Tongue. The trio operates as a unified combat entity, exhibiting seamless coordination that mirrors the interplay of actual oral components. This synergy enables them to predict each other’s movements and attacks flawlessly, forging a highly synchronized fighting force. Their collective style blends multiple martial arts disciplines, prioritizing coordinated teamwork above individual skill.

Physically indistinguishable from his siblings save for vocal distinctions, Tooth shares their black hair and matching features. During the Great Prison Battle Saga, the triplets were deployed to incapacitate the ex-heavyweight boxer Iron Michael. Employing tailored synchronized boxing tactics to leverage their numerical superiority, they initially overwhelmed him. Yet their individual limitations surfaced when isolated; each triplet conceded inferiority against adversaries of Iron Michael’s caliber alone.

The group’s cohesion disintegrated when Jun Guevaru intervened, violently incapacitating one sibling. This triggered immediate psychological collapse in Tooth and the remaining triplet, prompting their panicked flight from combat—one fled with visible loss of bodily control. This defeat revealed their core vulnerability: the inability to function cohesively or effectively once any member was neutralized.