Inclusion Criteria:  A history of tooth grinding sounds reported by a family member at least 3 times a week in the previous 6 months, Natural dentition having no more than 2 missing teeth except for the third molars  Exclusion Criteria:  Other known sleep disorders, Restricted mouth opening, History of orthodontic treatment, Current tobacco or alcohol consumption, Type 2 diabetes mellitus, Severe periodontitis or mobile teeth, Pharmacotherapy that might have affected the central nervous system.