Q Severe pain in tooth when I eat any thing cold or hot
Symptom that you describe is suggestive of teeth sensitivity. Its common causes are thinning of the enamel, receding gums, exposed nerve ending, dental cavity, broken tooth, etc. Treatment options range form desensitizing toothpaste to root canal, depending upon the severity. You should consult a dentist, who after an examination can tell you the exact cause and best treatment option for you.