The infected nerves need to be removed. If left untreated an infection can turn into an abscess, which is a much more serious problem that includes bone loss in the jaw.
The area around the tooth is numbed with a local anesthetic to start the procedure. The dentist will then drill down into the tooth to create an opening into the canal. They will then be able to remove infected tissue and clean the canal. After the infection has been removed, the space if filled with a sealant called gutta percha.
It is highly recommended that a tooth that has undergone a root canal is fitted with a crown. This will improve the appearance of the tooth, and will also make it much more likely that the root canal is successful.
Local anesthetics and proper pain medication allow the procedure to be performed with little to no pain in most cases.
There may be some soreness following the procedure, but that is normal for most dental procedures. Over the counter painkillers are usually enough to relieve any pain afterwards, but your dentist may prescribe medication.
The procedure will also relieve you from pain caused by the infection allowing you to enjoy all the foods you love without any pain from heat, cold, or biting too hard. If you are experiencing pain consult your dentist today.