I'll be honest with you -- there are pros and cons about root canals and I don't know who to believe! I needed a root canal and it took me almost a year to decide whether to have the root canal or have the tooth pulled.
Those who are against root canals will tell you that they can never get all the infection out of the tooth, and that someday, perhaps when you are older or your immune system is compromised somehow, that the infection will rear its ugly head and cause trouble.
The others say root canals are perfectly safe, and that if you opt to have the tooth pulled, there are dangers to that -- the infection can be spread into other parts of the body during the traumatic pulling, and there could be bone loss in the jaw due to not having a tooth there anymore.
I agonized over this decision. I really didn't know what to do. But in the end, I went with the root canal. I decided that I couldn't believe the majority of the dental profession would be in a conspiracy to deceive the public about the safety of root canals, especially when a tooth extraction and partial bridge are the same if not more money than a root canal and crown.
BUT I still believe that it is a very personal decision, and you should read some of the information available on the internet and make your own decision.
If you do go for the root canal, I highly recommend you have an endodontist do it instead of your regular dentist. The horror stories I hear about people having their root canals done two or three times and then needing the tooth pulled anyway (which was my biggest fear) had theirs done by a regular dentist. The endo is a specialist, and root canals are all he/she does.