The 5th annual Oklahoma Mission of Mercy free dental clinic will be held February 7-8 at the Oklahoma Chisolm Train Expo Center in Enid. The two-day clinic is hosted by the Oklahoma Dental Association. Volunteer dentists expect to treat more than 2-thousand patients. Anyone in the state is invited to travel to Enid. All services are free and there is no income requirement. Doors open at 5am Friday and Saturday.