| 摘要 |
Dentifrice compositions containing a cleaning agent in particulate form whose abrasivitiy is reduced by incorporating a water-insoluble particulate polymeric material less abrasive than and of lower average density than the cleaning agent which is calcium carbonate. The polymeric material is typically polymethylmethacrylate or polystyrene. The respective proportions are preferably 75-99.9% to 0.1-25%, by weight. The polymeric material is in the form of particles which are not substantially agglomerated and which may be of a variety of geometrical shapes including solid and hollow spheres, cavitied or uncavitied, or composed of a lattice of material.
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