a novel silica based bioactive glass composition that can be used in conjunction with a delivery agent such as a toothpaste , gel , etc . having a particle size range & lt ; 90 μgm which will form a rapid and continuous reaction with body fluids due to the immediate and long term ionic release of ca and p from the core silica particles , to produce a stable crystalline hydroxy carbonate apatite layer deposited onto and into the dentin tubules for the immediate and long term reduction of dentin hypersensitivity and tooth surface remineralization .