This could b either due to sensitivity due to loss of enamel surface or due to decay of tooth. Tooth decay can b treated by filling of tooth or by rct n capping of the decay is deep. Sensitivity can b reduced by using desensitizing toothpaste such as senquelf or sensodyne toothpaste by rubbing some amount of toothpaste onto your tooth surface n wait till 5 mins before rinsing it off. Get your teeth evaluated by dentist to know the cause of your problem n get treated accordingly. Regsrds.
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