Like to bite people may be the following reasons: First, bad habits, some people like to bite people since childhood, when not stopped by parents in a timely manner, this behavior may have been continued, especially after growing up appeared to love biting performance. Second, the expression of anger, repression, pain and other emotions, and the emergence of self-harm or injury to others, more common is the problem of biting. Third, character defects caused by the love of biting, some people are introverted, low self-esteem or sensitive, strong, and some people are selfish, more stubborn, love to drill, etc., these people are prone to become more temperamental, easily provoked, many people may appear to like biting performance.