Sensitivity of teeth is mostly due to loss of outer layer of teeth (enamel) and exposure of second layer of tooth (dentin). The dentine caries all sensation of air, water, cold to the nerve of tooth. So block these dentine layer you have to use desensitizing or nerve blocking tooth paste. You can use thermoseal ra, shy- nm, sensoform and also sensodyne.
You have to use these pastes by applying it on your tooth surface for 5-7 minutes, after that you can brush with the same tooth paste. It takes time to recover this condition but if you make an effort nothing is impossible.
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