Sometimes teeth can become too damaged to be restored by simply using a filling or a crown alone. The damage can come from decay, trauma, or other incidents that can lead to damage or exposure of the nerve. In these cases a root canal is used to salvage the tooth instead of simply extracting it. If the Doctor believes your tooth is a good candidate for a root canal then you will get an appointment with either a general dentist or root canal specialist depending on the difficult of the root canal. Note that it is common to need a crown after a root canal procedure to provide and ensure tooth structure, and to prevent the tooth from getting infected.