Iron Jaw (three sword style)

You have developed a outrageously powerful jaw that allows you to wield any weapon in your mouth! You can use the weapon as if it was held in your main hand. This feat allows you to also make an additional extra attack with the weapon in your mouth if you make at least 2 attacks with 2 other weapons using both your left and right hands in the same round however this extra attack can only happen once per turn.