A root canal is a surgical procedure used to remove infected nerve tissue from the inside of a tooth. This process will not show up on an x-ray unless the infection is severe and the patient is in extreme pain. A root canal can fail for any number of reasons. The most common reason is that the dentist failed to properly clean out the infected tissue. The second most common reason is that the root canal treatment did not completely remove the infected nerve tissue. The third most common reason is that the patient has an underlying health condition which causes the tooth to be more likely to fracture.

A root canal gone bad can be caused by a number of different things. One of the most common causes is infection. This can happen if you don't take care of your teeth. If you do take care of them, then the chances of getting an infected tooth are less likely to occur. Another cause is that the root canal sealer becomes loose or worn away. You can check to see if the sealer is wearing away by looking at it with a mirror. If it is coming off, then it is time for a new sealer. You can also tell if the sealer is worn away if it looks cloudy or if there are cracks in the tooth. If you notice any of these problems, then you should get a root canal done as soon as possible.

If you think you have a failed root canal, then you should see your dentist right away. If you have a toothache that you can not explain, then you should go to the dentist. You should also check your mouth for swelling or discoloration. These could be signs of an infection in your mouth.