An anticalculus composition comprises a dentifrice containing an organopolysiloxane chemically associated with an organic titanate and preferably having a pH of 4.5 to 9.0. The organic titanate may be a titanium ortho ester of formula Ti(OR)4 where R, which may be the same or different, are monovalent organic radicals e.g. tetra-n-butyl titanate, tetra-isopropyl titanate and tetrastearyl titanate. Alternatively, the organic titanate may be a titanium organic chelate of formula: <FORM:0967547/C3/1> wherein the radicals R, which may be the same or different, are monovalent organic radicals; the group Y, which may be the same or different, are organic radicals; and the group M, which may be the same or different, are electron donating atoms and/or radicals e.g. octylene glycol titanate, triethanolamine titanate, triethanolamine titanate -N- linseed acid salt, triethanolamine titanate -N- stearate and triethanolamine titanate -N- oleate. The organopolysiloxanes has a viscosity at 25 DEG C. of 20 to 100,000 centistokes and include the methyl, dimethyl and methyl phenyl silicones e.g. silicone DC200 and may comprise 5 to 15% of the composition. Enhanced results are obtained with the further addition of a lithium containing compound capable of being chemically associated with the organopolysiloxane e.g. lithium hydroxide, sulphate, acetate, fluoride, iodide, titanate, carbonate, stearate and other lithium soaps. The active ingredients are slurried in water to produce a smooth or creamy product in which the ingredients are chemically associated. The liquid diluent may be an alcohol such as isopropyl alcohol.  The compositions may be applied topically to the gums or incorporated in dentifrices with conventional excipients.ALSO:An anticalculus composition comprises a dentifrice containing an organopolysiloxane chemically associated with an organic titanate and preferably having a pH of 4.5 to 9.0.  The organic titanate may be a titanium ortho-ester of formula Ti(OR)4 where R, which is the same or different, are monovalent organic radicals e.g. tetra-n-butyl titanate, tetra-isopropyl titanate and tetrastearyl titanate.  Alternatively, the organic titanate may be a titanium organic chelate of formula <FORM:0967547/A5-A6/1> wherein the radicals R, which may be the same or different, are monovalent organic radicals; the groups Y, which may be the same or different, are organic radicals; and the groups M which may be the same or different, are electron donating atoms and/or radicals e.g. octylene glycol titanate, triethanolamine titanate, triethanolamine titanate-N-linseed acid salt, triethanolamine titanate-N-stearate or triethanolamine titanate-N-oleate.  The organopolysiloxanes have a viscosity at 25 DEG  C. of 20 to 100,000 centistokes and include the methyl, dimethyl and the methyl phenyl silicones e.g. Silicone DC 200 and may comprise 5 to 15% of the composition.  Enhanced results are obtained with the further addition of a lithium containing compound capable of being chemically associated with the organopolysiloxane e.g. lithium hydroxide, sulphate, acetate, fluoride, iodide, titanate, carbonate, stearate and other lithium soaps.  The active materials are slurried in water to produce a smooth or creamy product in which the ingredients are chemically associated.  Viscosity increasing agents; azulene; wound cleansing substances such as allantoin; humectants e.g. glycerol; and flavours e.g. menthol, thymol and oil of wintergreen may be present.  The liquid diluent may be an alcohol e.g. isopropyl alcohol.  The compositions may be applied topically to the gums or may be incorporated in dentifrices toothpastes, tooth powders, dental creams and chewing gums.