teeth have a protective layer called enamel with age the enamel wears off and become thin which causes to become teeth sensitive to cold and hot. You need to get a professional check up done to know the exact cause and solution of your problem. Without checking you clinically we can't suggest anything.
Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.