Abstract: Described are abrasive silica particles suitable for use in a dentifrice composition, the particles comprising particles of a first abrasive silica in an amount of at least 90 wt % relative to the total weight of the abrasive silica particles; and particles of a second abrasive silica in an amount of up to 10 wt % relative to the total weight of the abrasive silica particles, wherein the weight median particle diameter (d50) of the particles of the second abrasive silica is less than the weight median particle diameter (d50) of the particles of the first abrasive silica and from 15% to 70% of the d50 value of the particles of the first abrasive silica. Dentifrice compositions comprising such particles and methods of preparing such particles are also described.

Abstract: A dentifrice composition comprising an abrasive system comprising at least one abrasive silica which may be selected from a first silica having a Radioactive Dental Abrasion (RDA) in the range 30 to 150 and a second silica an RDA in the range 100 to 300, and a crystalline aluminosilicate having an average crystallite size below 0.2 ?m plus an orally acceptable carrier. The content by weight of the first silica being greater than that of the second silica and the RDA of the second silica being greater than that of first silica.

Abstract: A dentifrice composition comprising an abrasive system comprising a combination of a crystalline aluminosilicate having an average crystallite size below 1.0 ?m and a water-soluble, orally acceptable calcium sequestering agent plus an orally acceptable carrier. The crystalline aluminosilicate may have an RDA of less than 120 and a calcium binding capacity of at least 100 mg CaO per gram of anhydrous aluminosilicate. The water-soluble, orally acceptable calcium sequestering agent may be sodium tripolyphosphate.