is one piece episode 42 filler?

Arlong attacks Luffy, biting through a stone column with his teeth and crushing his swords. Stating his dependence for his crew members for support, Luffy punches Arlong in the face, destroying his teeth, but Arlong reveals he is able to regrow his teeth, with each new set of teeth being stronger than the last.

He is then uses his removed sets of teeth as handheld weapons. Luffy then takes one of Arlong's sets of teeth and also uses it as his own weapon, placing it in his mouth.