My kid has a habit of grinding her teeth. How can I correct her? Is it because of some deficiency?

Children and even adults sometimes have a condition where they constantly keep grinding their teeth without realizing they are doing it. It is a condition known as Bruxism. If your kid does this mostly while sleeping, it could point to bruxism. It mostly develops when a child's teeth does not grow the way it is supposed to grow. Sometimes it could also be due to any disorders in the endocrine system, pinworms or allergies, so it is better to consult a doctor. You can read this article to get more useful info http://www.webmd.com/oral-health/guide/teeth-grinding-bruxism?page=2