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You shouldn't have any sensitivity to cold or heat. It sounds as if maybe there is an opening somewhere in the filling or the tooth is cracked. If it continues I would go back to him, you may also need a root canal which your dentist should have known.
many times there is residual sensitivity due to mild trauma while drilling. if it doesnt feel better soon a repeat visit is advised but with the only symptom being mild cold sensitivity nothing indicates an impending root canal.