A vast population grinds and clenches their teeth. It generally occurs at night time as an involuntary act while sleeping. Often I see during a comprehensive exam, tooth wear and recession of the gums which often correlates to wear from grinding. Many patients are not aware of this until their dentist asks some very simple questions at their initial visit. Tooth wear can lead to many dental procedures to correct the destruction from grinding and clenching teeth. To learn more about a solution for teeth grinding and clenching, please read the following article provided by the Mayo Clinic: 

http://www.mayoclinic.com/health/dental-night-guards/AN01991