To provide an oral care product having excellent prophylactic effects on dental caries without containing a fluoride.

The oral care product comprises bisphosphonylated--polylysine. The oral care product is prepared by using the bisphosphonylated--polylysine, hydroxyapatite, and xylitol in combination. The oral care product is prepared by using the bisphosphonylated--polylysine, trehalose and a sugar alcohol in combination. The oral care product is prepared by using the bisphosphonylated--polylysine, and a nonreactive silicone compound in combination. The oral care product is prepared by using the bisphosphonylated--polylysine, and a potassium ion or a strontium ion, or a mixture thereof in combination. The oral care product is prepared by using the bisphosphonylated--polylysine, and a soluble calcium metal ion sequestering agent not being an oxidizing agent in combination.