When cultivators fought, they usually used their hands or feet. Otherwise, they would use some sort of weapon. Only a very, very small minority would choose to practice peculiar techniques such as Iron Head and so on.
However, apart from Hu Niu in the past, perhaps this youth was the only other person who used his mouth as a weapon.
Fu Tian's fighting style was almost a replica of Hu Niu's. However, he was even more vicious, with his steel-like hands being able to easily rip through his opponent's defenses. He would tear their intestines out and crush their throat with his mouth. In fact, he would attack in whatever manner as long as it could kill the enemy. He truly took full advantage of all his body parts.