Follow-Up: I was researching in the internet about this grinding of teeth at night. My 5-year old son grinds his teeth at night. Great great great grandparents in my country said that if you grind your teeth at night it means you have worms. What they do for children who grind their teeth is giving them a medication to get those worms out. In those great grandparents years, they use natural medicine such as herbs intended to clean the stomach from worms. They said it cures. My son most of the time touch dirty things and leak his fingers. Medical researchers may laugh at this message but I believe in my great great grandparents era when no medicine from Doctors at that time because they lived in uncivilized forest places. If I am only living in my home country this time, it is very easy for me to get those herbs they use for this kind of problem but I'm here in North America and I just rely on what Doctors recommend. I wonder why until now they can't find the cause of Bruxism.