1. Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
2. Department of Internship, Dental Interns College of Dentistry, BDS, King Saud University, Riyadh, Saudi Arabia
3. Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin AbdulAziz University, Al-kharj, Saudi Arabia