Tooth demineralization can be reversed, the main reversal measures are as follows: 1, strengthen oral hygiene: timely brushing and rinsing after meals every day to reduce the retention of plaque, less sugary foods and carbohydrates, effectively reduce the probability of tooth demineralization. 2, grinding away demineralized areas: when the surface of the teeth form superficial demineralized areas, you can apply a smooth turning needle to grind them away, and coat them with sodium fluoride, stannous fluoride, and other medications to enhance the enamel’s Acid resistance, improve enamel hardness, promote early caries remineralization. 3, promote remineralization: smooth lip and tongue surface, can be coated with remineralization liquid, high concentration of calcium ions can enter the internal dental tissues, promote remineralization. 4, filling cavities: the crown of the formation of deep caries holes, after removing the net decayed material can be applied to the filling of glass ionic cementum, which can continue to release fluoride ions, and further promote the remineralization of the teeth.