PROBLEM TO BE SOLVED: To provide a dental composition exhibiting high adhesiveness (initial adhesive strength and adhesive durability) not only to a healthy tooth substance but also to a tooth substance having a carious portion. A phosphoric acid group-containing monomer (A-1) represented by the following general formula (1) and a phosphoric acid group-containing monomer (A-2) represented by the following general formula (2) are prepared. A dental composition comprising and substantially free of water. (In the general formula (1), R1 represents a hydrogen atom or a methyl group, and m represents an integer of 6 to 12.) (in the general formula (2), R2 represents a hydrogen atom or It represents a methyl group, and n represents an integer of 3 to 5.) [Selection diagram] None【課題】健全な歯質のみならず、齲蝕部分が存在する歯質に対しても高い接着性（初期接着力および接着耐久性）を示す歯科用組成物を提供すること。 【解決手段】下記一般式（１）で示されるリン酸基含有単量体（Ａ－１）、および、下記一般式（２）で示されるリン酸基含有単量体（Ａ－２）を含み、水を実質的に含まない、歯科用組成物。【化１】（一般式（１）中、Ｒ1は水素原子またはメチル基を表し、ｍは６～１２の整数を表す。）【化２】（一般式（２）中、Ｒ2は水素原子またはメチル基を表し、ｎは３～５の整数を表す。）【選択図】なし
