Sure Ortho Etch contains phosphoric acid(37%) for etching tooth enamel and dentin when preparing surfaces for the application of composites. A high quality, non-drying, medium viscosity gel - it stays put when in place. Sure Ortho Etch is an easy and comfortable syringe to use. The tip can be angled to facilitate accurate placement of the gel - even in distal & lingual composite preparations. It washes off quickly and has excellent water solubility. The blue color ensures that it is clearly visible.