A dental adhesive primer composition comprises a mixture of (a) polymerizable compound of general formula (I) wherein R?1 and R2¿ are each lower alkylene; (b) hydroxy-group bearing lower alkyl ester of methacrylic acid (hereafter referred to as 'hydroxy monomers'); (c) polymerization accelerator; and (d) solvent. Dentin conditioning primer composition comprising a salt of compound (I) and having pH value 2.4-6.0. A method for improving the infiltration and adhesion of a dental adhesive primer comprising the compound (I) relies on administering hydroxy monomers in said composition, prior to application thereof to a surface of tooth.
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