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A dentist told me to use Sensodyne Toothpaste, it's made specifically for this condition. In two or three days, the sensitivity was gone. However, it doesn't clean the teeth quite as well, so I was advised to alternate between Sensodyne and regular toothpaste. I switch each day and I do fine.
There is nothing like "tooth sensitive to hot vs cold". It is caused by exposure of dentin a part of tooth which covers the nerves. Dentin has tiny tubes filled with fluid. Eating or drinking hot or cold cause a change in fluid movement which react in pain.
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