Acknowledgements
RECRUITMENT
The authors would like to thank Prof. Maha El Tantawi (Professor of Dental Public Health, Faculty of Dentistry, Alexandria University) for her guidance in the statistical analysis. We would like to extend our sincere thanks to Dr. Lobna Mohsen (assistant lecturer at the Faculty of Pharmacy, Alexandria University) for the preparation of the NSF varnish. We also thank Nouran Nabil for helping with patient recruitment and application of the agents.