This can be caused by decay or trauma to the tooth. Repairing such teeth by performing a root treatment can be challenging; having said that, saving a tooth from the bin is even rewarding. As far as the patient is concerned, the procedure itself under good anaesthesia is pain-free but may require a couple of visits to complete [click on image below to enlarge].
When a tooth is incurring endodontic problems, you may not even realise that there is an infection because the damage can be painless. When you look in your mouth you are only seeing the crown of the tooth whereas the the roots remain hidden beneath the gum line. As the infection progresses it starts to spread to the Root Canal System and this can then cause pain or an abscess (gum boil).