Is there an alternative?
You could have the whole tooth extracted, but it's always better to try to save it — especially since root canal treatment is routine and has a very high success rate (over 90%). Saving the tooth can prevent other troubles from occurring later on; these could include bite problems from teeth shifting position, difficulty eating, and loss of jawbone volume and density.
Is root canal treatment painful?
The procedure normally causes no more discomfort that a filling would. Root canal treatment may have a bad reputation, but it is undeserved; in this case it's the disease that's to blame and not the cure. In other words, the infections that make the treatment necessary in the first place are often painful because they are inflaming tissue that has lots of nerves and therefore is very sensitive. Root canal treatment actually relieves this pain!
What will happen during the procedure?
After numbing the area, a tiny hole in the crown (top) of your tooth is made to access the pulp chamber and canals. The diseased tissue is removed, and the pulp chamber and the canal(s) are disinfected all the way to the root end(s). Teeth in the front of the mouth have one root and generally one canal; back teeth have two or three roots and generally three or four canals. Those canals and the pulp chamber are filled with an inert, biocompatible material, and sealed with adhesive cement. The access hole will receive a temporary filling.
What will happen afterwards?
Your tooth may feel sensitive for a few days, but any discomfort can usually be relieved with over-the-counter pain medication or anti-inflammatories like ibuprofen. You will be instructed to avoid chewing on that tooth until it receives its permanent filling, which can be placed a few days later. Depending on how damaged the tooth was to begin with, it may need a full-coverage crown. Those options will be discussed with you.
How can I avoid the need for root canal treatment in the future?
Keep your teeth decay-free by brushing and flossing every day. Eat a healthy diet low in sugar and avoid acidic beverages such as soda. Have regular professional cleanings and exams. And if you're active in sports, consider ordering a custom-made mouthguard to protect your teeth from injury.