Endodontic treatment - root canal treatment. When caries is very deep it creates a pulp (nerve) inflammation. Inflammatory processes of low degree may be treated with proper medicines, leaving the tooth vital. However, with more advanced pulp inflammation, the tooth has to be treated endodonticly. If it’s possible the nerve is removed in local anaesthetic procedure. After an extremely precise cleaning and processing the root canal is later filled with gutta-percha, right to the very end of the canal, leaving no free space.