How can i stop nail and lip biting?

Difficult!: Nail biting is a very difficult habit to break. One thing you could do is have your child keep his hands covered with gloves to break the cycle of nail biting. Gently removing the childs fingers from their mouth each time you notice them biting is another method. In pharmacies, if you can find it, is nail biters liquid. This is a very bitter liquid painted on to the nails, and discourages biting.