This should be an x-ray, not a CT. X-ray can only see the bones, that is, how bad the teeth are, but the nerves can't see them, but they have to feel them themselves. If eating sweets hurts, it means you have reached the nerve. Filling teeth is generally not expensive, and dozens may be enough. If you put porcelain covers on your teeth, it will be expensive, maybe thousands. If it is generally a little poor, you can make up a little.