Why Does My Tooth Hurt After a Filling?

Like other parts of the body, if teeth are injured, there are nerves that say ouch.

When you have a cavity that has developed in your tooth, the tooth nerve responds. It can become hyper sensitive and say ouch more quickly, and last longer . A cavity is produced by an infection in the tooth. The acid produced by the germs eat away at the inside until a hole develops.
A filling really is like a biopsy on a tooth. The bad part is completely removed, (we don’t send it in for analysis though), and an artificial replacement is put back. The dentist’s skill combining art and science, makes the tooth look like new right away. Like any body injury, though, the tooth longer to recover, and the nerve, which may be slightly damaged, may be sensitive for a time. As it repairs, the tooth gradually feels better.
Sometimes the nerve doesn’t recover and then the tooth is treated with a root canal or extraction.
Preventive dentistry is the science of repairing problems before you have a toothache or tooth sensitivity. Treat cavities when they are small and the chance of a tooth ache, root canal or extraction drops to near zero.