A major cause of tooth sensitivity is root exposure. Kindly consult a dentist in person for further suggestion. We need more investigations with clinical examination to decide upon treatment. You may need cleaning along with desensitizing procedures and / or artificial enamel filling and / or root canal treatment. Advance procedures can be done with laser too. Until then apply a desensitizing paste (sensodyne tooth paste) on the teeth. Wait for 10 to 15 min until you brush your teeth with the same paste. Applying it overnight will be better.
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