OpalDam Green Kit: 4 - 1.2 ml Syringes, 10 Micro 20ga Tips 10 Black Mini Tips. Liquid dam, resin barriers used to isolate and protect soft tissue with an impervious seal. It applied directly and removed easily, giving you peace of mind without sacrificing efficiency. Light-reflective properties focus heat away from the teeth and gingiva for patient comfort. OpalDam Green contrasts perfectly with teeth, gingiva and boosting gels, making it ideal for use during in-office whitening procedure.