Visit a dentist for correct diagnosis of your problem.do not use desensitising toothpastes like sensodyne or colgate sensitive or any other.also do not use ayurvedic pastes like vajradanti or redpaste or dant kanti.first find out the cause.

All the anti sensitivity toothpastes do not have the same composition, and non medicated toothpastes are not going to provide any relief in this condition although they will be sufficient to maintain oral hygiene in terms of plaque removal. The most prudent step will be to visit a dentist so that the right cause of your sensitivity can be ascertained and the appropriate treatment can be explained to you. Otherwise you can use the medicated toothpaste which have better composition these days, like Colgate sensitive Pro relief or Vantej or sensodyne repair and protect. Regards