Hello & welcome, Having sensitivity in teeth by the use of cold or any kind of hot drink is indication either of attrition ( wear & tear ) of teeth or by the way of decaying of the teeth. In both the cases you will get sensitivity to cold or hot drinks, but definitely treatment will slightly differ depending on severity. Fist visit your dentist to get diagnosis between the above two condition which can easily be done by your dentist through clinical examination. Requirement of x-ray will be depending upon findings of clinical examination by your dentist. If there is attrition without exposing of live pulp tissue of the teeth , you will have to use anti hypersensitivity tooth paste for long term & controlled release painkiller taken once a day for short period. Your brushing technique has major impact compared to frequency of brushing. * Avoid Horizontal & forceful brushing which in turn causes wearing of the outer enamel layer of the teeth. * Avoid Drinking chilled stuff immediately after hot one & vice versa. * Put light but constant pressure while brushing & up down movements repeated with brush held horizontally. Maintaining oral hygiene will also keep caries away. If there is any carious teeth in your oral cavity, they will be treated with cement or silver filling. Take care.