A root treatment is said to be a painful experience. In reality, it is not worse than having a filling. The pain will be much worse if a necessary root treatment is not performed. If the nerve is dead, the treatment can even be performed without anaesthesia.
Following the treatment
Once the root treatment has been performed, the tooth may feel a bit tender, but it can be used as before. Though, it may be wise not to put too much strain on the tooth. A root treated tooth is weaker than a living tooth as the renewal of cells comes to a complete stop when the nerve is dead.
Additional treatment may be necessary
Because the tooth becomes more fragile over time, the dentist will often recommend having a post and a crown to reinforce the tooth. You can read more about posts and crowns elsewhere on these sites.