Human: What's the best way to stop nail biting? Assistant: 
The best way to stop nail biting is to identify and address the root cause of the behavior. Some possible causes include boredom, stress, or even a nutritional deficiency. Finding a healthy way to manage stress, such as exercise, deep breathing, or talking to a friend, can help reduce the urge to bite nails. Additionally, increasing your intake of nutrient-rich foods, such as fruits and vegetables, can help ensure your body has the vitamins and minerals it needs to stay healthy. Finally, occupying your hands with other activities, such as doodling or fidgeting with a stress ball, can provide a distraction and help you break the habit of nail biting.