My 5 year old is constantly chewing on things - her hair, the ribbon on her dress, random things. It is really driving us crazy. She did chew on her nails for a long time but we used Marvala nail polish and she stopped right away. Now this behaviour has started. I don't know if I should put Marvala on the tip of her hair, I don't want to have to cut it short. I know it is a nervous habit, I mess with my nails when I'm nervous. Does anyone have any ideas of how to break this habit? Asking and telling her to stop makes no difference, she is back at it as soon as I turn around.