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UltraCal XS is a uniquely formulated calcium hydroxide paste that is both aqueous and radiopaque. For years, calcium hydroxide has been recognized as an antibacterial agent due to its high pH (12.5) as well as its ability to potentially stimulate healing of periapical tissue. It is recommend the larger 29ga NaviTip tip to be used for predictable flow, enabling direct placement. UltraCal XS can be easily and thoroughly removed from the canal using Ultradent Citric Acid and a NaviTip FX tip.