Isodam HD Polyisoprene Dental Dam is used to isolate specific areas of the mouth during dental procedures and increase patient comfort. The high-definition royal blue color enhances contrast to teeth and improves dental imaging. Non-Latex Polyisoprene. Keeps Operatory Field Dry. Tear Resistant With Superior Elasticity. Royal Blue Colour For Enhanced Contrast To The Teeth And Improved Dental Imaging. Isodam HD provides the award-winning performance of the Isodam non-latex dental dam in a royal blue color for enhanced contrast to the teeth and improved dental imaging.