My 5-year-old son grinds his teeth while sleeping, too. But not too often. WebMed says that teeth grinding among children is associated with improperly aligned teeth, and other illnesses like: nutritional deficiencies; allergies; pinworms. Psychological factors, like stress and anxiety can also cause teeth grinding. For further reading, please refer to this site: http://www.webmd.com/oral-health/guide/teeth-grinding-bruxism?page=2
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