Nail biting should not be dismissed simply as a bad habit. According to experts, it is more than a bad habit. It can also be a symptom of obsessive compulsive disorder. There are several reasons for nail biting. You may bite your nails when you are nervous, stressed or bored. Regardless of the underlying cause of this unhealthy habit, it makes your ugly nails and prevents them from growing naturally. Here’s an interesting video that will show you how to stop biting nails and grow out.