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The sensitivity is the sensation of pain in our teeth due to loss of a coating. 
watch the sensodyne add and you'll get it
this is not  a joke so please dont report this as abuse...
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Dude I think you are the only one who learns even from TV ads. Great!!
hahahahah thanks
Tooth sensitivity is caused by the gradual exposure of the softer path of our tooth that lies under the tooth enamel,called dentine.
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