How do you stop a child from grinding her teeth all the time?

Problem. Grinding at night between ages 3-6 not a problem as usually disappears spontaneously. Grinding during day is a problem, and may be symptomatic of tension, adhd, ocdc, high sugar diet, or neurologic disorder. Have child checked by both dentist and pediatrician.
Diet. I have answered this above. High calorie malnutrition is the common cause. Stop all forms of sugar and provide "god-made" food.