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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.
One theory is that when severe cold hits the nerve on the roof of your mouth it causes referred pain. Referred pain is when the pain occurs in one place in the body but is felt elsewhere. Another theory is that very cold food temporarily alters blood flow to your brain, causing localized pressure and a brief headache.