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There are several possible causes of tooth sensitivity to cold foods. Some common causes include:

1. Worn tooth enamel, which can expose the sensitive dentin layer underneath.

2. Receding gums, which can also expose sensitive tooth roots.

3. Tooth decay or a cracked tooth, which can lead to sensitivity.

4. Using a toothbrush with hard bristles, which can wear down enamel and cause sensitivity.

To address your sensitivity, a dentist may recommend:

1. Using a toothpaste specifically formulated for sensitive teeth.

2. Using a soft-bristled toothbrush to avoid further wear on your enamel.

3. Avoiding highly acidic or sugary foods and drinks, which can erode enamel.

4. Applying fluoride gel or varnish to strengthen tooth enamel.

5. Fixing any dental problems that may be causing your sensitivity, such as filling a cavity or treating gum disease.

It's important to see a dentist to get a proper diagnosis and treatment plan for your tooth sensitivity. They will be able to give a more accurate diagnosis and a treatment plan after examination.