### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have raised white lines inside my mouth, both cheeks that started after having a root canal redone. the one thats a little worse also had cold sore/fever blisters at the end by my lips.  After the cold sores/fever blisters went away I got a small white bump on my lower gum about 2nd to last tooth (the one that had the root canal redone.)  I went back to the specialist that did the root canal and my dentist and all they say is that we will watch it, is this something I should get a second opinion on?

### output:

Hello, Thanks for your query. It sounds like you have a fistula. The fistula is the result of an abscessed tooth and a failed root canal. The abscess is an infection that first forms around the apex or tip of the root. If left untreated the infection will begin to erode the bone around the tooth. You are going to need root canal surgery called an apicoectomy in order to save this tooth. Usually, a tooth that has undergone a root canal can last the rest of your life and never need further endodontic treatment. However, in a few cases, a tooth may fail to heal. The tooth may become painful or diseased months or even years after successful treatment. An apicoectomy is a way to save a tooth when inflammation or infection persists in the bony area around the end of your tooth after a root canal procedure. The endodontist will open the gum tissue near the tooth to see the underlying bone and to remove any inflamed or infected tissue. The very end of the root is also removed. A small filling may be placed to seal the end of the root canal and a few stitches are placed in the gum to help the tissue heal. The dentist will remove the bump or fistula and with a good result and a good immune system the tooth will heal, and the fistula will not return. I do hope that you have found something helpful, and I will be glad to answer any further query. Take care