<prompt> The best method to reduce radiation caries is application of0.5 neutral sodium fluoride gel1 neutral sodium fluoride gel0.5 stannous fluoride gel1 stannous fluoride gel  <response>: The best method to reduce radiation caries is daily application of a viscous topical 1 neutral sodium fluoride gel in custom-made applicator trays. The best results are achieved from a combination of restorative dental procedures, excellent oral hygiene, a diet restricted in cariogenic foods, and topical applications of sodium fluoride. Patient cooperation in maintaining oral hygiene is extremely important because radiation caries is a lifelong threat. Teeth with gross caries or periodontal involvement are often extracted before irradiation.Key Concept:The best method to reduce radiation caries is daily application of a viscous topical 1 neutral sodium fluoride gel in custom-made applicator trays.White and Pharoahs Oral Radiology Principles and Interpretation 8th edition 