I haven't bite anyone during physical fight because I am more of targeting the nose,the chin and the eyes when I want to hurt someone. It really gives me success when I am targeting the weakest part, especially the groin, but nope, I am done with physical fights. However, if I need to defend myself from someone who is strangling me in the neck, making me hard to breathe I do not think twice but I will bite that person if I can reach the skin. My goal is to survive the strangling and I need to defend myself. For health issues, you can eat the allergies or the dirt of someone's skin when you bite it. It can cause some illnesses that could lead to a major one if you do not take antibiotics and vitamins. You need to brush your teeth as well. What is important is that you defend yourself.