What can i do about tooth aches when exposed to something cold?

Depends on whether: The cold sensitivity is due to gum recession and exposure of the dentinal tubules or if it is due to caries (decay). The former can be treated using a de-sensitizing toothpaste like sensodyne. The relief is not immediate - can take many weeks. In the meanwhile avoid acidic foods and liquids. The latter needs to be evaluated and treated by a dentist (filling). I would see a dentist regardless.

Sensodyne: If your teeth only hurt with cold food or drink, and pain goes away in a few seconds, using a desensitizing toothpaste should help.

Hyperemia pulpitis: If all teeth are sensitive to cold and sensitivity goes away in a few seconds, then there is no pulpal pathology and sensory e will help. However if is primarily one tooth, and the pain lingers, then you suffer from pulpitis and need a root canal!

Cause determines Tx: There are many causes of tooth sensitivity to cold. You may even have different problems with different teeth. The cause will determine the appropriate treatment. Therefore see your dentist to have your teeth evaluated.