Dental desensitizers have a certain effect, but the effect of desensitizers and the use of time has a certain relationship, and some patients to a certain extent, after a certain degree of dental desensitizers will no longer produce the effect of the superimposed effect, and may no longer produce a new impact on the results. So for dentin desensitization, now commonly used in two ways, the formation of new restorative dentin to cover the dentin tubules, blocking the dentin tubules, so that the degree of sensitivity is reduced. However, there are limitations, that is, if the restorative dentin does not form a sufficient thickness, will form a new dentin sensitivity, or dentin tubules for blocking, because of the optical effect or the effect of the drug, with the passage of time to shed, and will form a new dentin tubules exposed, the result is the formation of a new sensitivity, so dentin desensitizers will be used in the clinic, but with the Therefore, dentin desensitizers are used in the clinic, but the effects need to be observed over time, and not every patient is suitable for them.