Dentifrice preparation

Claim 1

An opaque dentifrice comprising a liquid vehicle which contains at least about 35% by weight of water, up to about 10% by weight of gelling agent, about 10-50% by weight of a polishing material at least a major portion of which is a siliceous polishing material having an empirical SiO 2 content of at least 70%, a particle size in the range from 1 to 35 microns, substantially amorphous X-ray structure and a refractive index of about 1.40-1.47 and as an additional polishing agent an amount of about 5-20% by weight of the dentifrice of a dentally acceptable polishing agent selected from the group consisting of calcined alumina, alpha-alumina trihydrate, dicalcium phosphate dihydrate, anhydrous dicalcium phosphate, insoluble sodium metaphosphate, calcium carbonate and mixtures thereof, said amount of said additional polishing agent not exceeding the amount of said siliceous polishing agent, about 0.1-5% by weight of a surface active agent containing sodium alkyl sulphate wherein the alkyl group contains 10-18 carbon atoms, with about 40-70% of the alkyl groups being C 12 and about 0.1-15% by weight of a water soluble, orally acceptable salt of an alkylene diamine tetramethylene phosphonic acid, wherein the alkylene group contains 1-10 carbon atoms, said dentifrice being smooth and without substantial soft lump rheological deformation.