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A dental fistula is a canal, usually small in size, that originates from a tooth infection and opens out into the oral cavity near the gums.
You need a dental crown after root canal therapy because post this treatment your tooth will become fragile, there could be a chance of coronal leakage and lastly, crown increases the durability of the permanent restoration.
Root canal therapy prevents the need for tooth removal, but root canal treatment has a few limitations. The treatment doesn't come with a 100% guarantee, and the procedure can fail at times. Alternatives to root canal treatment are tooth extraction, ozone therapy, laser root canal therapy, diet changes, and pulp capping.
Root canal pain entirely depends upon the underlying cause which led to the RCT and your threshold to bear the pain. Most people report a feeling of little sensitivity or tenderness of the tooth for a few days after having a root canal. There could be several reasons.
A root canal treatment or RCT is a conventional therapy to save a non-vital or inflamed tooth. It is a conservative form of treatment which means that minimal tooth structure is replaced and treated to prevent extraction of the tooth. In this therapy, the inflamed and infected or completely non-vital soft tissue of the tooth, known as the dental pulp, is removed and replaced with inert dental cement.