I am a 63 year old female. For at least 15 years I have had an area of sensitivity in a particular area of my mouth - I've never been sure if it's the bridge or the tooth next to it. Sensitive to cold mainly, but also when chewing crisp or hard foods. It had been getting worse for a couple of months earlier this year, and hurt also when I ate or drank hot foods. Then fairly suddenly it started throbbing all the time, whether I was eating or not. Even when brushing those teeth provoked throbbing. The dentist took an x-ray of the entire upper set of teeth and prescribed a couple of antibiotics and painkillers. When the pain and infection had finally settled, he took a few more x-rays and did two lots of root canal treatment on the tooth in front of the bridge. He gave me some Sensodyne and Meridol toothpastes to try. It is now three months hence and my teeth are still uncomfortable when I eat or drink hot things, very uncomfortable when I brush them, and extremely painful when I eat or drink cold foods. What should I do? I've spent thousands of rand and am still not ok. Please help.