The present invention provides a dentinal tubule sealing material excellent in initial dentinal tubule sealing property, durability of dentinal tubule sealing against acid, operability and storage stability. The present invention relates to a fluoroapatite particle (A) having an average particle size of 0.6 to 10 μm, an inorganic particle (B) having an average particle size of 0.6 to 10 μm that reacts with water to produce apatite, and a non-aqueous system. The present invention relates to a one-part dentinal tubule sealing material characterized by containing a dispersant (C).本発明は、初期の象牙細管封鎖性、酸に対する象牙細管封鎖の耐久性、操作性及び貯蔵安定性に優れる象牙細管封鎖材を提供する。本発明は、平均粒子径が０．６～１０μｍであるフルオロアパタイト粒子（Ａ）、水と反応してアパタイトを生成する平均粒子径が０．６～１０μｍである無機粒子（Ｂ）及び非水系分散剤（Ｃ）を含有することを特徴とする１材型の象牙細管封鎖材に関する。
