A root canal in a baby tooth is a procedure that involves taking out the coronal portion (top/ upper half) of the pulp of a tooth. Each of your teeth has a pulp, which is often called the nerve. If this pulp becomes infected by decay or is damaged in any way, it will need to be removed. After a root canal, a crown is always placed to protect the tooth, as it is now weaker and more likely to fracture without a crown surrounding it. If this procedure is recommended and not performed in a timely manner, then extraction will be required.