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Just to be clear, There is a difference between pain and sensitivity. Pain is when your teeth hurt, like when you fall down and your knee/elbow hurt. Sensitive is a tingling sensation. It is present only when there is exposure to cold, hot, sour or initial disease. You might be facing sensitivity issues here like the others have mentioned.
It is caused by having something cold touch the roof of the mouth (palate), and is believed to result from a nerve response causing rapid constriction and swelling of blood vessels or a referring of pain from the roof of the mouth to the head.