D/Sense Crystal DUAL-ACTION CRYSTAL PRECIPITATE DESENSITIZER GELLAST ONE Contents:6 x 1.0ml syringes & 24 SofNeedle Crystal DesensitizerEffective, all-purpose desensitizer. Direct delivery syringe for fast, efficient application. Low film thickness, only 3 microns. Will not build up.Dual action formula, tubule occlusion plus the desensitization effects of potassium nitrate crystals. Compatible with all cements.