An oral care composition is disclosed comprising calcium silicate, from 1 to 20% by weight of a potassium phosphate salt, a tubule blockage enhancer selected from calcium dihydrogen phosphate, calcium sulfate hemihydrate or mixtures thereof and a physiologically acceptable carrier, wherein the calcium silicate and the potassium phosphate salt is present in a weight ratio from 10:1 to 1:5.COMPOSICIÓN PARA EL CUIDADO BUCAL.