PROBLEM TO BE SOLVED: To optimize the compounding ratio of hydroxyapatite to promote remineralization of teeth and enhance the effect of nutritional support. An oral composition that promotes remineralization of teeth, wherein natural or mineral-derived hydroxyapatite (Hydroxyapatite) is mixed at a weight ratio of 3% to 80% and citric acid at 1% to 40%. It is characterized by being done. Further, it is characterized in that calcium carbonate is mixed in a weight ratio of 3% to 80% and citric acid in a weight ratio of 1% to 40%. Further, deep sea water may be mixed at 0.01% to 20%, bromelain at 2% to 4%, and xylitol at 10% to 50% by weight. [Selection diagram] None【課題】ハイドロキシアパタイトの配合比率を最適化し、歯の再石灰化を促進させると共に栄養を補助する効果を高める。【解決手段】歯の再石灰化を促進させる経口組成物であって、天然由来または鉱物由来のハイドロキシアパタイト（Hydroxyapatite）が３％～８０％、クエン酸が１％～４０％の重量比で混合されたことを特徴とする。また、炭酸カルシウムが３％～８０％、クエン酸が１％～４０％の重量比で混合されたことを特徴とする。さらに、海洋深層水が０．０１％～２０％、ブロメライン（Bromelain）が２％～４％、キシリトール（Xylitol）が１０％～５０％の重量比で混合されても良い。【選択図】なし
